[gnome-applets] build: add AX_IS_RELEASE

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 2b31ec60769f88b5baef9557d35258fb7a956b85
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Sep 27 16:30:58 2015 +0300

    build: add AX_IS_RELEASE

 configure.ac |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 008e5aa..e180287 100644
--- a/configure.ac
+++ b/configure.ac
@@ -23,6 +23,12 @@ AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 
 dnl **************************************************************************
+dnl Set release policy
+dnl **************************************************************************
+
+AX_IS_RELEASE([git-directory])
+
+dnl **************************************************************************
 dnl Initialize automake
 dnl **************************************************************************