Bump the version number to 1.2.0.

Author: kbrenneman

configure.ac

@@ -2,7 +2,7 @@ dnl configure.ac
 dnl Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.63])
-AC_INIT([libglvnd], [1.1.1], [kbrenneman@nvidia.com])
+AC_INIT([libglvnd], [1.2.0], [kbrenneman@nvidia.com])
 AC_CONFIG_SRCDIR([config.h.in])
 AC_CONFIG_HEADERS([config.h])