[four-in-a-row] build fix: check for zlib

[Thomas Hindoe Paaboel Andersen <thomashpa src gnome org>]

commit 8acd1c3b138c268c764e3f4ee9ddbec1b9d73317
Author: Thomas Hindoe Paaboel Andersen <phomes gmail com>
Date:   Wed Oct 10 18:31:08 2012 +0200

    build fix: check for zlib

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3c1f1d8..289342b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,6 +21,7 @@ PKG_CHECK_MODULES(FOUR_IN_A_ROW, [
   gtk+-3.0 >= $GTK_REQUIRED
   librsvg-2.0 >= $RSVG_REQUIRED
   libcanberra-gtk3 >= $CANBERRA_GTK_REQUIRED
+  zlib
 ])
 
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