Compile fix for MSVC: Do not include sys/resources.h

Do not include header files when compiling with MSVC that do not exist and which are also not included when compiling with MINGW. A direct consequence is that git can be compiled again with MSVC because the missing "sys/resources.h" is no longer included. Instead of current #ifndef mingw32 is the only one that is strange ... everything for systems that is not strange ... #else ... include mingw specific tweaks ... #endif #ifdef msvc is also strange ... include msvc specific tweaks ... #endif it turns things around and says what it wants to achieve in a more direct way, i.e. #if mingw32 #include "compat/mingw.h" #elif msvc #include "compat/msvc.h" #else ... all the others ... #endif which makes it a lot simpler. Signed-off-by: Vincent van Ravesteijn <vfr@lyx.org> Helped-by: Junio C Hamano <gitster@pobox.com> Acked-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>