[gvfs] build: Silence automake portability warnings

[Ross Lagerwall <rossl src gnome org>]

commit 8ec1666eb2a42dad7e4bafe4545b0d945f4fbc29
Author: Ross Lagerwall <rosslagerwall gmail com>
Date:   Sat Apr 19 22:27:53 2014 +0100

    build: Silence automake portability warnings
    
    Require GNU Make for now and so silence portability warnings.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=722354

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 44130ad..ad13fdd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 AC_PREREQ([2.64])
 
 AC_INIT([gvfs],[1.21.2],[http://bugzilla.gnome.org/enter_bug.cgi?product=gvfs])
-AM_INIT_AUTOMAKE([1.11.1 no-dist-gzip dist-xz tar-ustar])
+AM_INIT_AUTOMAKE([1.11.1 no-dist-gzip dist-xz tar-ustar -Wno-portability])
 
 AC_CONFIG_HEADERS(config.h)
 AC_CONFIG_MACRO_DIR([m4])