dri/common: include stdio.h where needed

Acked-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: José Fonseca <jfonseca@vmware.com>

src/mesa/drivers/dri/common/utils.c

@@ -30,6 +30,7 @@
  */
 
 #include <string.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
 #include <stdint.h>

src/mesa/drivers/dri/common/xmlconfig.c

@@ -28,6 +28,7 @@
  */
 
 #include <stdarg.h>
+#include <stdio.h>
 #include <string.h>
 #include <assert.h>
 #include <expat.h>