[nautilus-sound-converter] Use AM_MAINTAINER_MODE([enable])

[Brian Pepple <bpepple src gnome org>]

commit 8b94b5572396b5de6bb3aa08c831f2612cf1c4f0
Author: Brian Pepple <bpepple fedoraproject org>
Date:   Tue Sep 27 10:26:16 2011 -0400

    Use AM_MAINTAINER_MODE([enable])

 configure.ac |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 2adf980..0e0f446 100644
--- a/configure.ac
+++ b/configure.ac
@@ -8,6 +8,8 @@ AC_CONFIG_HEADERS(config.h)
 AM_INIT_AUTOMAKE([1.11.1 no-dist-gzip dist-xz tar-ustar check-news])
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
+AM_MAINTAINER_MODE([enable])
+
 dnl -----------------------------------------------------------
 dnl Checks for programs.
 dnl -----------------------------------------------------------