[gnome-session] Add AM_PROG_CC_C_O

[Matthias Clasen <matthiasc src gnome org>]

commit e5711e50faa5cd2ed127e2fed0d249f0ee6d90e8
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Aug 28 16:54:43 2011 -0400

    Add AM_PROG_CC_C_O
    
    automake complained about its absence.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=646673

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ca9eb93..307f9bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,6 +12,7 @@ m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 # Check for programs
 AC_PROG_CC
+AM_PROG_CC_C_O
 AC_PATH_PROG(GLIB_GENMARSHAL, glib-genmarshal)
 PKG_PROG_PKG_CONFIG()