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

[Stefan Walter <stefw src gnome org>]

commit 261ab9bee11e02874577a0facaa8b93a6433539e
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'
    
    https://bugzilla.gnome.org/show_bug.cgi?id=689046

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6db9a77..c2a4ea4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -59,7 +59,7 @@ VAPIGEN_CHECK([0.16])
 AC_ARG_WITH(vapidir, [AC_HELP_STRING([--with-vapidir], [Directory for VAPI files]),
             ], [], [VAPIGEN_VAPIDIR=$with_vapidir])
 
-if "$with_vapidir" = ""; then
+if test "$with_vapidir" = ""; then
 	VAPIDIR="$VAPIGEN_VAPIDIR"
 else
 	VAPIDIR="$with_vapidir"