[corlib][tests] Disable tests that requires Windows (dllimport) on mobile profile

This enables building the tests w/bitcode enabled on AppleTV (and they
were already excluded from the results anyway).

Part of the fix for
https://bugzilla.xamarin.com/show_bug.cgi?id=36569

mcs/class/corlib/Test/System.Reflection/MethodInfoTest.cs

@@ -52,7 +52,12 @@ namespace MonoTests.System.Reflection
 	[TestFixture]
 	public class MethodInfoTest
 	{
+#if MONOTOUCH
+		// use an existing symbol - so we can build without dlsym. It does not matter that the signature does not match for the test
+		[DllImport ("libc", EntryPoint="readlink", CharSet=CharSet.Unicode, ExactSpelling=false, PreserveSig=true, SetLastError=true, BestFitMapping=true, ThrowOnUnmappableChar=true)]
+#else
 		[DllImport ("libfoo", EntryPoint="foo", CharSet=CharSet.Unicode, ExactSpelling=false, PreserveSig=true, SetLastError=true, BestFitMapping=true, ThrowOnUnmappableChar=true)]
+#endif
 		public static extern void dllImportMethod ();
 		[MethodImplAttribute(MethodImplOptions.PreserveSig)]
 		public void preserveSigMethod ()
@@ -108,8 +113,13 @@ namespace MonoTests.System.Reflection
 			DllImportAttribute attr = (DllImportAttribute)((t.GetMethod ("dllImportMethod").GetCustomAttributes (typeof (DllImportAttribute), true)) [0]);
 
 			Assert.AreEqual (CallingConvention.Winapi, attr.CallingConvention, "#1");
+#if MONOTOUCH
+			Assert.AreEqual ("readlink", attr.EntryPoint, "#2");
+			Assert.AreEqual ("libc", attr.Value, "#3");
+#else
 			Assert.AreEqual ("foo", attr.EntryPoint, "#2");
 			Assert.AreEqual ("libfoo", attr.Value, "#3");
+#endif
 			Assert.AreEqual (CharSet.Unicode, attr.CharSet, "#4");
 			Assert.AreEqual (false, attr.ExactSpelling, "#5");
 			Assert.AreEqual (true, attr.PreserveSig, "#6");

mcs/class/corlib/Test/System.Runtime.InteropServices/MarshalTest.cs

@@ -805,6 +805,7 @@ namespace MonoTests.System.Runtime.InteropServices
 			}
 		}
 
+#if !MOBILE
 		[DllImport ("kernel32.dll", SetLastError = true)]
 		[PreserveSig]
 		static extern uint GetModuleFileName (
@@ -816,6 +817,7 @@ namespace MonoTests.System.Runtime.InteropServices
 			[MarshalAs (UnmanagedType.U4)]
 			int nSize
 		);
+#endif
 	}
 #if !NET_2_1
 	[ComImport()]

mcs/class/corlib/Test/System.Security.Cryptography.X509Certificates/X509CapiTest.cs

@@ -72,6 +72,7 @@ namespace MonoTests.System.Security.Cryptography.X509Certificates {
 			File.Delete("temp.b64");
 		}
 
+#if !MOBILE
 		public IntPtr GetHandleEx (byte[] certificate) 
 		{
 			CertificateContext cc = new CertificateContext ();
@@ -151,6 +152,7 @@ namespace MonoTests.System.Security.Cryptography.X509Certificates {
 			Assert.AreEqual (serial, x509.GetSerialNumber (), "GetSerialNumber");
 			Assert.AreEqual ("02720006E8", x509.GetSerialNumberString (), "GetSerialNumberString");
 		}
+#endif
 
 		[Test]
 		[ExpectedException (typeof (ArgumentException))]