Fix -ansi -pedantic warning (can't cast a pointer to function

to a pointer to object, that is, int foo(); void *bar= (void*) foo
is not allowed.

sql/lex.h

@@ -32,10 +32,10 @@ SYM_GROUP sym_group_rtree= {"RTree keys", "HAVE_RTREE_KEYS"};
 #define SYM(A) SYM_OR_NULL(A),0,0,&sym_group_common
 #define F_SYM(A) SYM_OR_NULL(A)
 
-#define CREATE_FUNC(A) (void *)(SYM_OR_NULL(A)), &sym_group_common
+#define CREATE_FUNC(A) (void (*)())(SYM_OR_NULL(A)), &sym_group_common
 
 #ifdef HAVE_SPATIAL
-#define CREATE_FUNC_GEOM(A) (void *)(SYM_OR_NULL(A)), &sym_group_geom
+#define CREATE_FUNC_GEOM(A) (void (*)())(SYM_OR_NULL(A)), &sym_group_geom
 #else
 #define CREATE_FUNC_GEOM(A) 0, &sym_group_geom
 #endif

sql/lex_symbol.h

@@ -25,7 +25,7 @@ typedef struct st_symbol {
   const char *name;
   uint	tok;
   uint length;
-  void *create_func;
+  void (*create_func)();
   struct st_sym_group *group;
 } SYMBOL;