(malloc, realloc, free) [emacs]: Undefine macros before defining.

src/ChangeLog

@@ -5,6 +5,9 @@
 	* lisp.h (XPNTR) [!NO_UNION_TYPE && !HAVE_SHM && !DATA_SEG_BITS]:
 	Cast bitfield value to EMACS_INT, to suppress gcc warning.
+	* xrdb.c (malloc, realloc, free) [emacs]: Undefine macros before
+	defining.
+
 2006-02-03  Kim F. Storm  <storm@cua.dk>
 	* xdisp.c: Cache last merged escape glyph face.

src/xrdb.c

@@ -88,6 +88,10 @@ extern char *get_system_name ();
 /* Make sure not to #include anything after these definitions.  Let's
    not step on anyone's prototypes.  */
 #ifdef emacs
+/* darwin.h may have already defined these.  */
+#undef malloc
+#undef realloc
+#undef free
 #define malloc xmalloc
 #define realloc xrealloc
 #define free xfree