recent mingw modifications.

PR: 1312
Submitted by: Oliver Tappe <zooey@hirschkaefer.de>
Reviewed by: Ulf Moeller

the operating systems where they are the normal line endings

 - fix indentation
 - rename some functions and macros
 - fix up confusion between SSL_ERROR_... and SSL_AD_... values

afford to relax SPARCV9/8+ compiler command line and produce "unversal"
binaries as we used to.

Engage run-time switch between bn_mul_mont_fpu and bn_mul_mont_int.

possible usage is to pass -Wl,-z,-noexecstack on Linux to ensure the stack
is marked non-executable. Well, -Wa,--noexecstack works fine too...

have impact on performance, because amount of multiplications does not
increase with this switch, not on sparcv9 that is. On the contrary, it
actually improves performance, because it spares a load of instructions
used to chase carries. Not to mention that BN assembler modules can be
shared more freely between 32- and 64-bit builts.

Submitted by: Stefan Neis