[metacity] build: remove GNOME_MAINTAINER_MODE_DEFINES

[Alberts Muktupāvels <muktupavels src gnome org>]

commit d230fbcdf2dc29cdd66b77db35b6da84975a77ff
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Sep 20 01:11:16 2015 +0300

    build: remove GNOME_MAINTAINER_MODE_DEFINES

 configure.ac |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index dd7cb2c..8d9188e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,8 +16,6 @@ AM_INIT_AUTOMAKE([1.11.1 no-dist-gzip dist-xz])
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])],)
 AM_MAINTAINER_MODE([enable])
 
-GNOME_MAINTAINER_MODE_DEFINES
-
 # Honor aclocal flags
 AC_SUBST(ACLOCAL_AMFLAGS, "\${ACLOCAL_FLAGS}")