[gnome-builder] build: fix AS_CASE() keyword

[Christian Hergert <chergert src gnome org>]

commit 3a21d6472a8cef971ce5ce723d861be81c41a207
Author: Christian Hergert <christian hergert me>
Date:   Thu May 14 13:31:17 2015 -0700

    build: fix AS_CASE() keyword
    
    We don't need the x prefix here.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0d9d5f9..9e2455f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -120,7 +120,7 @@ AC_ARG_ENABLE(debug,
                              [turn on debugging @<:@default=builder_debug_default@:>@]),
               ,
               enable_debug=builder_debug_default)
-AS_CASE(["x$enable_debug"],
+AS_CASE(["$enable_debug"],
         [yes],[
             DEBUG_CFLAGS="$DEBUG_CFLAGS -O0"
             DEBUG_CFLAGS="$DEBUG_CFLAGS -g"