Bump libva to 2.0.1.pre1 for development

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
diff --git a/configure.ac b/configure.ac
index a0216f9..ad53d0a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,7 +42,7 @@
 # - reset micro version to zero when VA-API major or minor version is changed
 m4_define([libva_major_version], [m4_eval(va_api_major_version + 1)])
 m4_define([libva_minor_version], [m4_eval(va_api_minor_version)])
-m4_define([libva_micro_version], [0])
+m4_define([libva_micro_version], [1])
 m4_define([libva_pre_version],   [1])
 
 m4_define([libva_version],