[gnome-shell] Revert "configure: Turn off -Werror by default"

[Jasper St. Pierre <jstpierre src gnome org>]

commit c856cbb5239d14bbbc455ad3766d88a443820b45
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Wed Feb 29 22:38:00 2012 -0500

    Revert "configure: Turn off -Werror by default"
    
    This reverts commit ea061b0f4644efaf7d0cb4673b03af9b98b23d01.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index de95e2f..074e655 100644
--- a/configure.ac
+++ b/configure.ac
@@ -212,7 +212,7 @@ GTK_DOC_CHECK([1.15], [--flavour no-tmpl])
 # minimum/yes/maximum are the same, however.
 AC_ARG_ENABLE(compile_warnings,
   AS_HELP_STRING([--enable-compile-warnings=@<:@no/minimum/yes/maximum/error@:>@],[Turn on compiler warnings]),,
-  enable_compile_warnings=maximum)
+  enable_compile_warnings=error)
 
 changequote(,)dnl
 if test "$enable_compile_warnings" != no ; then