libva 1.6.0 pre2

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
diff --git a/configure.ac b/configure.ac
index 557618a..1ee38e5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,7 @@
 m4_define([libva_major_version], [m4_eval(va_api_major_version + 1)])
 m4_define([libva_minor_version], [m4_eval(va_api_minor_version - 32)])
 m4_define([libva_micro_version], [0])
-m4_define([libva_pre_version],   [1])
+m4_define([libva_pre_version],   [2])
 
 m4_define([libva_version],
           [libva_major_version.libva_minor_version.libva_micro_version])