[gnome-builder] build: cleanup xdg-app check

[Christian Hergert <chergert src gnome org>]

commit d745cabb740825f640cd45315db97eb2d6117d47
Author: Christian Hergert <chergert redhat com>
Date:   Fri Apr 22 02:36:41 2016 -0700

    build: cleanup xdg-app check

 plugins/xdg-app/configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/xdg-app/configure.ac b/plugins/xdg-app/configure.ac
index 4763700..5e74f1c 100644
--- a/plugins/xdg-app/configure.ac
+++ b/plugins/xdg-app/configure.ac
@@ -20,5 +20,5 @@ AS_IF([test "$enable_xdg_app_plugin" != no],[
        enable_xdg_app_plugin=$have_xdg_app
 ])
 
-AM_CONDITIONAL(ENABLE_XDG_APP_PLUGIN, test x$enable_xdg_app_plugin = xyes)
+AM_CONDITIONAL(ENABLE_XDG_APP_PLUGIN, [test "x$enable_xdg_app_plugin" = "xyes"])
 AC_CONFIG_FILES([plugins/xdg-app/Makefile])