mesa: Silence compiler warnings on Windows.
diff --git a/src/mesa/shader/prog_print.c b/src/mesa/shader/prog_print.c
index 11f82c1..014d08f 100644
--- a/src/mesa/shader/prog_print.c
+++ b/src/mesa/shader/prog_print.c
@@ -363,7 +363,7 @@
       _mesa_printf(".xyzw\n");
    }
    else {
-      char *s = _mesa_swizzle_string(swizzle, 0, 0);
+      const char *s = _mesa_swizzle_string(swizzle, 0, 0);
       _mesa_printf("%s\n", s);
    }
 }