[rhythmbox] Update ACLOCAL_AMFLAGS to install third-party macros

[Jonathan Matthew <jmatthew src gnome org>]

commit b3fced726a0078a37c027cbd13652e0d2a03b847
Author: Jonathan Matthew <jonathan d14n org>
Date:   Wed Jul 8 22:45:40 2015 +1000

    Update ACLOCAL_AMFLAGS to install third-party macros
    
    https://wiki.gnome.org/Projects/GnomeCommon/Migration

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index bc954be..c97392c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,4 @@
-ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
+ACLOCAL_AMFLAGS = --install -I m4 ${ACLOCAL_FLAGS}
 
 DISTCHECK_CONFIGURE_FLAGS = --disable-schemas-install --enable-gtk-doc --disable-scrollkeeper
 distuninstallcheck_listfiles = find . -type f -print | grep -v '^\./var/scrollkeeper'