[pango] Bump fontconfig dep to 2.10.91

[Matthias Clasen <matthiasc src gnome org>]

commit 48423ef827f5fcedac92e1e73c29f0bb94eeadda
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 10 06:24:15 2013 -0500

    Bump fontconfig dep to 2.10.91
    
    This is the first version of fontconfig that is thread-safe.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 7ed2832..a67bb18 100644
--- a/configure.ac
+++ b/configure.ac
@@ -233,7 +233,7 @@ AM_CONDITIONAL(HAVE_HARFBUZZ, $have_harfbuzz)
 #
 have_fontconfig=false
 if $have_harfbuzz ; then
-  PKG_CHECK_MODULES(FONTCONFIG, fontconfig >= 2.5.0, have_fontconfig=true, AC_MSG_RESULT([no]))
+  PKG_CHECK_MODULES(FONTCONFIG, fontconfig >= 2.10.91, have_fontconfig=true, AC_MSG_RESULT([no]))
 fi
 
 #