Remove unneeded or outdated _MSC_VER macro #ifs

[Karlson2k]

Small cleanup

[theuni]

surely some of these things really are guards for msvc and not windows in general?

[Karlson2k]

Some of them - for windows platform. They replaced with 'TARGET_WINDOWS'
'#pragma once' is supported in GCC since at least version 3.4.

[Karlson2k]

@theuni typo fixed.
Build tested on Ubuntu and Windows.

[wsoltys]

@Karlson2k I really hope for the day when you provide something useful like real bug fixes and such :)
@theuni some of the defines where necessary for different vs versions. But since we just support nothing older than vs2010 I guess we could remove them.

[Karlson2k]

@wsoltys Cleanup is boring, but it's something that allow to avoid bugs and easier future development.

[Voyager1]

Just be careful, on Win32 we have also the mingw gcc compiler which may make the distinction between _WIN32 and _MSC_VER. My 2cts.

[Karlson2k]

@Voyager1, thanks, right comment. MinGW-compiled code left untouched.

[davilla]

need a window dev to hit the button :)

[Voyager1]

I'm generally OK, with the exception of S_ISDIR and S_ISREG (see line comment)... I'll let @wsoltys make the final decision.

[wsoltys]

Still wonder why linux/PlatformDefs.h contains TARGET_WINDOWS. But thats a different story

[davilla]

legacy ?