[gnome-system-monitor] Fix --disable-wnck option

[Robert Roth <robertroth src gnome org>]

commit 30fb8a4a95228d57cc154afc0dd8a0ed55224a3d
Author: Stefano Facchini <stefano facchini gmail com>
Date:   Wed Jul 9 11:37:53 2014 +0200

    Fix --disable-wnck option
    
    https://bugzilla.gnome.org/show_bug.cgi?id=732942

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 5ebae8a..b6a1748 100644
--- a/configure.ac
+++ b/configure.ac
@@ -56,7 +56,7 @@ PKG_CHECK_MODULES(GSM,
 AC_PATH_PROG(APPDATA_VALIDATE, appdata-validate)
 AC_PATH_PROG(DESKTOP_FILE_VALIDATE, desktop-file-validate)
 
-AC_ARG_ENABLE(wnck, AS_HELP_STRING([--enable-wnck], [enable wnck support]),enable_wnck=yes,enable_wnck=no)
+AC_ARG_ENABLE(wnck, AS_HELP_STRING([--enable-wnck], [enable wnck 
support]),enable_wnck="$enableval",enable_wnck=no)
 if test "x$enable_wnck" != "xno"; then
         PKG_CHECK_MODULES(WNCK, libwnck-3.0 >= $LIBWNCK_REQUIRED)
         AC_DEFINE(HAVE_WNCK, 1, [Define if libwnck is available])