*include/assert.h: Qualify all functions with __MINGW_NOTHROW.
*include/conio.h: Likewise.
*include/ctype.h: Likewise.
*include/direct.h: Likewise.
*include/dos.h: Likewise.
*include/errno.h: Likewise.
*include/fenv.h: Likewise.
*include/float.h: Likewise.
*include/inttypes.h: Likewise.
*include/io.h: Likewise.
*include/libgen.h: Likewise.
*include/locale.h: Likewise.
*include/malloc.h: Likewise.
*include/mbctype.h: Likewise.
*include/mbstring.h: Likewise.
*include/process.h: Likewise.
*include/search.h: Likewise.
*include/setjmp.h: Likewise.
*include/signal.h: Likewise.
*include/stdio.h: Likewise.
*include/stdlib.h: Likewise.
*include/string.h: Likewise.
*include/time.h: Likewise.
*include/wchar.h: Likewise.
*include/sys/stat.h: Likewise.
*include/sys/time.h: Likewise.
*include/sys/timeb.h: Likewise.
*include/sys/utime.h: Likewise.