[totem-pl-parser] build: Add AX_IS_RELEASE macro

[Philip Withnall <pwithnall src gnome org>]

commit 400d233e98cfdef5f57a10c1579cfa416f47cd37
Author: Philip Withnall <withnall endlessm com>
Date:   Mon Dec 19 08:00:25 2016 +0000

    build: Add AX_IS_RELEASE macro
    
    This is useless by itself but is needed to key various new macros (which
    will be added shortly) about whether they are running for a release or
    debug build.
    
    https://wiki.gnome.org/Projects/GnomeCommon/Migration
    
    https://bugzilla.gnome.org/show_bug.cgi?id=776259

 configure.ac |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 11e5938..3c3820d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,6 +12,8 @@ AC_CONFIG_SRCDIR([plparse/totem-pl-parser.c])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 
+AX_IS_RELEASE([git-directory])
+
 AM_INIT_AUTOMAKE([1.9 dist-xz no-dist-gzip check-news subdir-objects])
 AM_MAINTAINER_MODE([enable])
 AC_USE_SYSTEM_EXTENSIONS