try again to make gmp _EXTERN_INLINE consistent

src/racket/src/gmp/gmp.c

@@ -17,9 +17,6 @@ along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 MA 02111-1307, USA. */
 
-#define _FORCE_INLINES
-#define _EXTERN_INLINE /* empty */
-
 #include "../schpriv.h"
 #include "gmp.h"
 #include "gmp-impl.h"

src/racket/src/gmp/gmp.h

@@ -74,6 +74,9 @@ MA 02111-1307, USA. */
 #endif
 #endif
 
+/* To avoid unnecessary compiler dependencies, always defined: */
+#define _FORCE_INLINES
+
 #ifdef _SHORT_LIMB
 typedef unsigned int		mp_limb_t;
 typedef int			mp_limb_signed_t;