[ostree] core: use GLIB_VERSION_MAX_ALLOWED=2.28

[Colin Walters <walters src gnome org>]

commit 5a0af4413119e1dfa46d9838ae461c5d4afa48e1
Author: Colin Walters <walters verbum org>
Date:   Fri May 25 15:00:45 2012 -0400

    core: use GLIB_VERSION_MAX_ALLOWED=2.28
    
    We want to build/run even on relatively old OSes, so that we can
    be used to bootstrap and maintain newer builds.

 Makefile.am |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 9d31e09..fba107f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -16,7 +16,8 @@
 # Boston, MA 02111-1307, USA.
 
 ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
-AM_CPPFLAGS = -DDATADIR='"$(datadir)"' -DLIBEXECDIR='"$(libexecdir)"'
+AM_CPPFLAGS = -DDATADIR='"$(datadir)"' -DLIBEXECDIR='"$(libexecdir)"' \
+	-DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_28 -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_28
 AM_CFLAGS = $(WARN_CFLAGS)
 
 NULL =