[clutter] build: Look for sed

[Emmanuele Bassi <ebassi src gnome org>]

commit 42508e60917bcf12f20d5e49c5b192a30e985044
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Mon Apr 4 22:33:31 2011 +0100

    build: Look for sed
    
    Use AC_PROG_SED to find sed in a portable way.

 configure.ac |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3891670..40f88ec 100644
--- a/configure.ac
+++ b/configure.ac
@@ -79,6 +79,8 @@ CLUTTER_LT_AGE=lt_age
 CLUTTER_LT_VERSION="$CLUTTER_LT_CURRENT:$CLUTTER_LT_REV:$CLUTTER_LT_AGE"
 CLUTTER_LT_LDFLAGS="-version-info $CLUTTER_LT_VERSION"
 
+AC_PROG_SED
+
 AC_CANONICAL_HOST
 AC_MSG_CHECKING([if building for some Win32 platform])
 AS_CASE([$host],