[mutter] Avoid declaring variables in for loop to avoid upsetting older GCC

[Owen Taylor <otaylor src gnome org>]

commit e3db4ab16a65be692c969088a6e1487dde305fc4
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Thu Sep 3 16:12:06 2015 -0400

    Avoid declaring variables in for loop to avoid upsetting older GCC
    
    Older GCC only allows "for (int i" in explicit c99 mode - there's probably
    no reason that we can't enable that, but avoiding the construct for
    a fast fix.

 src/wayland/meta-wayland-keyboard.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/wayland/meta-wayland-keyboard.c b/src/wayland/meta-wayland-keyboard.c
index 8d136c9..c4836cb 100644
--- a/src/wayland/meta-wayland-keyboard.c
+++ b/src/wayland/meta-wayland-keyboard.c
@@ -485,7 +485,8 @@ meta_wayland_keyboard_update_key_state (MetaWaylandKeyboard *keyboard,
 {
   gboolean mods_changed = FALSE;
 
-  for (gint i = offset; i < key_vector_len * 8; i++)
+  int i;
+  for (i = offset; i < key_vector_len * 8; i++)
     {
       gboolean set = (key_vector[i/8] & (1 << (i % 8))) != 0;