[gnome-shell-extensions] build: Properly quote $enable_extensions

[Giovanni Campagna <gcampagna src gnome org>]

commit 13b8b3c22c4fcd6994f0d18a2cbabb5c4229210b
Author: Michael Biebl <biebl debian org>
Date:   Mon May 21 00:10:16 2012 +0200

    build: Properly quote $enable_extensions
    
    Otherwise test will complain if more then one extension in enabled, i.e.
    when we have a space in the configure argument.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=676446

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 82ba6ed..c140eea 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,7 +40,7 @@ AC_ARG_ENABLE([extensions],
 	[],
 	[enable_extensions=$DEFAULT_EXTENSIONS]
 )
-if test x$enable_extensions = xall; then
+if test x"$enable_extensions" = xall; then
    enable_extensions="$ALL_EXTENSIONS"
 fi