[mutter] configure: Lower minimum libwacom version

[Carlos Garnacho <carlosg src gnome org>]

commit e6972924d08eb88b21f53234988717a505a26499
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Jul 22 23:43:44 2016 +0200

    configure: Lower minimum libwacom version
    
    We don't need such a recent libwacom. The tablet descriptions in
    newer libwacom versions are welcome, but is nothing mutter
    directly relies on.

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 177313f..d1ea124 100644
--- a/configure.ac
+++ b/configure.ac
@@ -59,7 +59,7 @@ AM_PATH_GLIB_2_0([2.49.0])
 CANBERRA_GTK=libcanberra-gtk3
 CANBERRA_GTK_VERSION=0.26
 
-LIBWACOM_VERSION=0.19
+LIBWACOM_VERSION=0.13
 
 MUTTER_PC_MODULES="
    gtk+-3.0 >= 3.19.8