[libsoup] Honor aclocal flags

[Dan Winship <danw src gnome org>]

commit c3f0763bcc42714b6c4f5fadf28baa9dd5466460
Author: Craig Keogh <cskeogh adam com au>
Date:   Sat Dec 3 11:33:59 2011 +0100

    Honor aclocal flags
    
    https://bugzilla.gnome.org/show_bug.cgi?id=641470

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 861daff..bb94238 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,5 +1,5 @@
 ## Process this file with automake to produce Makefile.in
-ACLOCAL_AMFLAGS = -I m4
+ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 
 SUBDIRS = libsoup tests docs