This fixes #645765.

All targets that get built are tracked by the engine, to avoid
unnecessary builds of targets. This should be reset on engine.Build,
unless it is explicitly requested *not to* reset it, via BuildFlags.

MSBuild hosts like monodevelop, which use the same logger
for multiple builds, get errors/warnings from older builds.
So, reset them whenever the BuildFinished event is raised.

ILogger.Shutdown () is invoked when the host is about to quit,
according to msdn, so can't use that.

The problem is that Android only exposes Java APIs for ~everything of
consequence, including/especially X509 Certificate validation.  Since
we want Mono-based HTTPS support to use the underlying platform
certificates, this requires some amount of Java-using glue.  However,
we don't want to pull in a ton of Java glue into System.dll (bleh!),
so we'll instead place the glue into Mono.Android.dll's
Android.Runtime.AndroidEnvironment.TrustEvaluateSsl(), and instead
create a delegate which will invoke TrustEvaluateSsl() when needed.

	When disposing a socket that has more than one asynchronous read/write
	pending, one of the callbacks could call DisposeAllOnClose() while
	another one is waiting on the lock. Once the lock is acquired,
	queue.Count will be 0 and Dequeue would fail.
	This if fixed now.

	Fixes bug #645675.

	The Expression Tree interpreter was previously limited to
	lambda expression for either an Action or a Func delegate.
	This fix removes this limitation. Fixes #645770.

* Makefile: Compile tests with TEST defined (to include System.Web.Util.
MachineKeySectionUtils unit tests)
* System.Web.dll.sources: Move MachineKeySectionUtils.cs from System.
Web.Configuration_2.0 to System.Web.Util
* System.Web_test.dll.sources: Move MachineKeySectionUtilsTest.cs from
System.Web.Configuration_2.0 to System.Web.Util

* System.Web.Configuration_2.0/MachineKeySection.cs: Adjust using
clauses. Uncomment some code. Fix TripleDES versus 3DES for Validation
under NET_4_0. Remove 'private' on fields/methods.
* System.Web.Handlers/AssemblyResourceLoader.cs: Adjust using clauses
* System.Web.Security/MembershipHelper.cs: Adjust using clauses
* System.Web.Security/RolePrincipal.cs: Adjust using clauses
* System.Web.SessionState_2.0/SessionId.cs: Adjust using clauses
* System.Web.UI/LosFormatter.cs: Adjust using clauses.
* System.Web.Util/MachineKeySectionUtils.cs: Moved from System.Web.
Configuration_2.0. Rename namespace and remove 'internal' on type
declaration

* Test/System.Web.Util/MachineKeySectionUtilsTest.cs: Moved from Test/
System.Web.Configuration/MachineKeySectionTest.cs. Add test case for
TripleDES versus 3DES

* System.Web.Configuration_2.0/MachineKeyRegistryStorage.cs:
Remove key length check and generic key generation.

* System.Web.Configuration_2.0/MachineKeySection.cs: Add support for 4.0
ValidationAlgorithm and the use of custom algorithms (validation and
decryption). Allow the use of any, valid, key length (based on the
algorithm). Let each algorithm creates its own key (e.g. special needs,
default length...)

* System.Web.Configuration_2.0/MachineKeySectionUtils.cs: Remove key
generation (from random) code and 192bits key length hack (won't work
with custom algorithms). Add support for new (4.0) algorithms, including
custom ones. Provide uniform/shared code to Encrypt/Decrypt, Sign/Verify
and EncryptSign/VerifyDecrypt using MachineKeySection data.

* System.Web.Configuration_2.0/MachineKeyValidation.cs: Add new (4.0)
values.

* System.Web.Configuration_2.0/MachineKeyValidationConverter.cs: Add
support for new (4.0) algorithms.

* System.Web.Handlers/AssemblyResourceLoader.cs: Use the new common
cryptographic code and base64 the encrypted data.

* System.Web.Security/FormsAuthentication.cs: Use the new common
cryptographic code and base64 the signed and/or encrypted data.

* System.Web.Security/MembershipHelper.cs: Use the new common
cryptographic code - this should be 100% compatible with existing data.

* System.Web.Security/RolePrincipal.cs: Use the new common cryptographic
code.

* System.Web.Security/SqliteMembershipProvider.cs: Adapt code for
internal API change.

* System.Web.UI/LosFormatter.cs: Adapt code for internal API change.
Fix some small behaviro changes wrt NET_4_0

* System.Web.UI/ObjectStateFormatter.cs: Use the new common cryptographic
code.

* System.Web.UI/Page.cs: Remove code that is now unneeded (with the new
common cryptogrraphic code).

* System.Web.Configuration_2.0/MachineKeyCompatibilityMode.cs: New.

* Test/System.Web.Configuration/MachineKeyValidationConverterTest.cs:
Add more, mostly 4.0, test cases.

* Test/System.Web.Security/FormsAuthenticationTest.cs: Add test case to
ensure HashPasswordForStoringInConfigFile is not case sensitive.

* Test/System.Web.UI/LosFormatterTest.cs: Add some rountrip test cases
with the different ctors

* console-io.h, console-null.c, console-unix.c, console-win32.c,
gc.c: instead of executing tons of managed code in signal context,
we wake up the finalizer thread and any complex console-specific
code will be handled there. This can cause a (usually small) delay,
but it's much better than deadlocking.

* loader.c: we don't search the current directory anymore for shared
libraries referenced in DllImport attributes, as it has a slight
security risk. We search in the same directory where the referencing
image was loaded from, instead. Fixes bug# 641915.

	* class.c (mono_class_setup_vtable): Fail the class if
	we fail to load its overloads.

	Fixes #562156

IsolatedStorageFile.GetUserStoreForApplication() would previously throw an
IsolatedStorageException because no ApplicationIdentity was provided by the
AppDomain.

We would like to provide this method in a workable fashion to facilitate code
portability with Windows Phone 7, which exposes only this method for saving
files to stable storage.

Thus, skip the ApplicationIdentity and code identity checks for MOBILE
(MonoDroid, MonoTouch) so that IsolatedStorage Just Works.

	* verify.c (mono_verifier_verify_class): Don't allow parent to
	be a GTD.

	Fixes #562150

	* verify.c (is_valid_generic_instantiation): A GTD cannot
	be used as generic argument. Check for those conditions
	even if the argument has no constraints.

	Fixes #562771

	* mini-exceptions.c (mono_find_jit_info): Treat
	dynamic method wrappers as managed methods.

	* DynamicMethodTest.cs: Add test for GetCurrentMethod.

	Fixes #640702

	* verify.c (verify_generic_parameters): If a generic constraint
	is a generic instance, it must respect the constraint of that
	type too.

	Fixes #644935