Misc

[kapi1525]

Like i said, a collection of random tiny changes from my fork.
Most don't really make a difference here.

• Changed many compile time guards to output an error when building for an unsupported platform. That error gives clear info where changes are needed during porting.
• Fixed an android compiler warning.
• Changed some windows style path separators to the normal ones (/), to fix building with linux version of android ndk.
• Made PrintFHintAfter work with any clang compiler. Before it used a macro that is not present on some platforms.
• Added a few missing BUILDTYPEs from the og F2.5 sdk.
• Replaced non standard SIZE_T_MAX with SIZE_MAX.

Also, i don't have a mac to test, so i really hope i didn't make any mistakes there...