[empathy/gnome-2-34] escape USE_MAINTAINER_MODE to prevent errors from make

[Sjoerd Simons <sjoerds src gnome org>]

commit 718a788ac2d4120fa007cd329afb5b29f8fd087b
Author: Sjoerd Simons <sjoerd simons collabora co uk>
Date:   Wed Feb 23 18:30:03 2011 +0000

    escape USE_MAINTAINER_MODE to prevent errors from make

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index cf10131..e3302ea 100644
--- a/configure.ac
+++ b/configure.ac
@@ -223,7 +223,7 @@ PKG_CHECK_MODULES(GCR,
     gcr-0 < 2.91)
 
 # Enable GSEAL checks if needed
-if test $USE_MAINTAINER_MODE = yes; then
+if test "x$USE_MAINTAINER_MODE" = "xyes"; then
   AC_DEFINE(GSEAL_ENABLE, [], [Seal public structs to force usage of accessors])
 fi