Removed the broken mmap64 configure check, and moved the
_FILE_OFFSET_BITS define to wine/port.h. Made sure that all files that
need the define include it.

diff --git a/tools/sfnt2fnt.c b/tools/sfnt2fnt.c
index ecf3ae9..dcae9db 100644
--- a/tools/sfnt2fnt.c
+++ b/tools/sfnt2fnt.c
@@ -19,6 +19,7 @@
  */
 
 #include "config.h"
+#include "wine/port.h"
 
 #include <assert.h>
 #include <ctype.h>