[libgnome-keyring] configure.ac: if [list]; then construct: [list] is to be executed, thus use 'test'

[Dominique Leuenberger <dleuen src gnome org>]

commit 172752582d5885c458b4c3035228b5d9772faf34
Author: Dominique Leuenberger <dimstar opensuse org>
Date:   Sun Nov 25 21:25:59 2012 +0100

    configure.ac: if [list]; then construct: [list] is to be executed, thus use 'test'

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 517014f..37b6a74 100644
--- a/configure.ac
+++ b/configure.ac
@@ -57,7 +57,7 @@ GOBJECT_INTROSPECTION_CHECK([1.30.0])
 VAPIGEN_CHECK([0.16])
 
 AC_ARG_WITH(vapidir, [AC_HELP_STRING([--with-vapidir], [Directory for VAPI files]),
-            ], [], [VAPIGEN_VAPIDIR=$with_vapidir])
+            ], [VAPIGEN_VAPIDIR=$with_vapidir])
 
 if test "$with_vapidir" = ""; then
 	VAPIDIR="$VAPIGEN_VAPIDIR"