Fix my last commit to match our libgc's declaration style.

libgc/include/private/gc_priv.h

@@ -1454,7 +1454,7 @@ GC_bool GC_is_tmp_root GC_PROTO((ptr_t p));
 void GC_register_dynamic_libraries GC_PROTO((void));
   		/* Add dynamic library data sections to the root set. */
 
-GC_INNER void GC_cond_register_dynamic_libraries(void);
+void GC_cond_register_dynamic_libraries GC_PROTO((void));
 		/* Remove and reregister dynamic libraries if we're     */
 		/* configured to do that at each GC.                    */