* include/_mingw.h (_CRTIMP): Define for __GNUC__ if

__declspec(dllimport)  supported.
	(__cdecl): Define if not already defined.
	(__stdcall): Likewise.
	* include/dirent.h: Qualify fuctions with __cdecl.
	* include/fenv.h: Likewise.
	* include/inttypes.h: Likewise.
	* include/assert.h: Qualify fuctions with __cdecl. Qualify
	CRT dll imports with _CRTIMP.
	* include/conio.h: Likewise.
	* include/ctype.h: Likewise.
	* include/direct.h: Likewise.
	* include/dos.h: Likewise.
	* include/errno.h: Likewise.
	* include/float.h: Likewise.
	* include/io.h: Likewise.
	* include/locale.h: Likewise.
	* include/malloc.h: Likewise.
	* include/math.h: Likewise.
	* include/mbctype.h: Likewise.
	* include/mbstring.h: Likewise.
	* include/process.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/wctype.h: Likewise.
	* include/sys/stat.h: Likewise.
	* include/sys/timeb.h: Likewise.
	* include/sys/utime.h: Likewise.

	* include/ctype.h: Guard ctype inlines with __NO_INLINE__.
	* include/wctype.h: Guard wctype inlines with __NO_INLINE__.

	* include/stdio.h (__VALIST): Guard against prior definition.

winsup/mingw/include/dos.h

@@ -92,7 +92,7 @@ struct _diskfree_t {
 #define _DISKFREE_T_DEFINED
 #endif  
 
-unsigned _getdiskfree (unsigned, struct _diskfree_t *);
+_CRTIMP unsigned __cdecl _getdiskfree (unsigned, struct _diskfree_t *);
 
 #ifndef	_NO_OLDNAMES
 # define diskfree_t _diskfree_t