[gnome-code-assistance] Add back missing GCA_BACKENDS_EXEC_DIR

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 1f8e38bcb8b5e7ad3e5b574a6181c7773443e972
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Fri Nov 15 00:49:49 2013 +0100

    Add back missing GCA_BACKENDS_EXEC_DIR

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index c408338..c567593 100644
--- a/configure.ac
+++ b/configure.ac
@@ -471,6 +471,7 @@ adl_RECURSIVE_EVAL("$datadir", [datadirex])
 AC_SUBST(datadirex)
 
 GCA_BACKENDS_EXEC_DIR="$backendexecdir_unex"
+AC_SUBST(GCA_BACKENDS_EXEC_DIR)
 
 GCA_BACKENDS_DIR="$GCA_BACKENDS_EXEC_DIR/backends"
 AC_SUBST(GCA_BACKENDS_DIR)