Replace X-allocation functions with their C89 counterparts

The only remaining X-functions used in server are XNF*, the rest is converted to
plain alloc/calloc/realloc/free/strdup.

X* functions are still exported from server and x* macros are still defined in
header file, so both ABI and API are not affected by this change.

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

glx/indirect_util.c

@@ -88,7 +88,7 @@ __glXGetAnswerBuffer( __GLXclientState * cl, size_t required_size,
         intptr_t  temp_buf;
 
         if ( cl->returnBufSize < worst_case_size ) {
-	    void * temp = xrealloc( cl->returnBuf, worst_case_size );
+	    void * temp = realloc( cl->returnBuf, worst_case_size );
 	    
 	    if ( temp == NULL ) {
 	        return NULL;