[devhelp] build: Stop setting ACLOCAL_AMFLAGS

[Sébastien Wilmet <swilmet src gnome org>]

commit 798288b72d22a16ed3bb9406daaf915a21d9684a
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Thu Nov 10 16:36:57 2016 -0600

    build: Stop setting ACLOCAL_AMFLAGS
    
    This is deprecated and will break with a future version of Automake.
    Also, we already call AC_CONFIG_MACRO_DIR([m4]) in configure.ac, so it's
    also useless. The downside is that it will introduce a nag warning from
    libtool, but that's a libtool bug.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774069

 Makefile.am |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index c2ebead..f47e6ae 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,3 @@
-ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 AM_DISTCHECK_CONFIGURE_FLAGS = --enable-introspection
 
 SUBDIRS = po src data misc contrib docs