Fix MinGW64 problem with non-compliant vsnprintf.

 makeint.h (__USE_MINGW_ANSI_STDIO) [__MINGW64_VERSION_MAJOR]:
 Define for MinGW64, to force it to use an ANSI-compliant
 implementation of vsnprintf.  Reported by Christian Boos
 <cboos@edgewall.org>.
1 file changed