Bug #24588: "MBROverlaps missing in 5.1?"

The MBR-prefixed function aliases (e.g., MBROVERLAPS()) were missing in 5.1, after
some code refactoring left them out.  This simply adds them into the func_array list.

sql/item_create.cc

@@ -4792,6 +4792,12 @@ static Native_func_registry func_array[] =
   { C_STRING_WITH_LEN("MAKE_SET"), BUILDER(Create_func_make_set)},
   { C_STRING_WITH_LEN("MASTER_POS_WAIT"), BUILDER(Create_func_master_pos_wait)},
   { C_STRING_WITH_LEN("MBRCONTAINS"), GEOM_BUILDER(Create_func_contains)},
+  { C_STRING_WITH_LEN("MBRDISJOINT"), GEOM_BUILDER(Create_func_disjoint)},
+  { C_STRING_WITH_LEN("MBREQUAL"), GEOM_BUILDER(Create_func_equals)},
+  { C_STRING_WITH_LEN("MBRINTERSECTS"), GEOM_BUILDER(Create_func_intersects)},
+  { C_STRING_WITH_LEN("MBROVERLAPS"), GEOM_BUILDER(Create_func_overlaps)},
+  { C_STRING_WITH_LEN("MBRTOUCHES"), GEOM_BUILDER(Create_func_touches)},
+  { C_STRING_WITH_LEN("MBRWITHIN"), GEOM_BUILDER(Create_func_within)},
   { C_STRING_WITH_LEN("MD5"), BUILDER(Create_func_md5)},
   { C_STRING_WITH_LEN("MLINEFROMTEXT"), GEOM_BUILDER(Create_func_geometry_from_text)},
   { C_STRING_WITH_LEN("MLINEFROMWKB"), GEOM_BUILDER(Create_func_geometry_from_wkb)},