MINGW: git-compat-util.h: use inttypes.h for printf macros.

Also, pass -D__USE_MINGW_ANSI_STDIO=0 to select MSVCRT-compatible
macro definitions.
MSVC: config.mak.uname: drop -D__USE_MINGW_ACCESS from compile definitions

-D__USE_MINGW_ACCESS only affects MinGW and does nothing when
MSVC is used.