[aravis] build: explicitely requires zlib.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit 1d9292045a1584b647df1a579eaf8309ba0a0bb2
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Sun Nov 3 16:11:09 2013 +0100

    build: explicitely requires zlib.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index ede3b6e..60b3a6b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,7 +54,7 @@ AC_ARG_ENABLE(cpp_test,
 
 PKG_PROG_PKG_CONFIG([0.14])
 
-ARAVIS_REQUIREMENTS="glib-2.0 >= 2.26 gobject-2.0 gio-2.0 libxml-2.0 gthread-2.0"
+ARAVIS_REQUIREMENTS="glib-2.0 >= 2.26 gobject-2.0 gio-2.0 libxml-2.0 gthread-2.0 zlib"
 ARAVIS_GSTREAMER_REQUIREMENTS="gstreamer-base-0.10 >= 0.10.31 gstreamer-app-0.10 gstreamer-interfaces-0.10"
 
 PKG_CHECK_MODULES(ARAVIS, [$ARAVIS_REQUIREMENTS])