va: keep compatibility with the backend driver built against 0.34.x

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
diff --git a/va/va.c b/va/va.c
index ae853bb..c770f0d 100644
--- a/va/va.c
+++ b/va/va.c
@@ -246,6 +246,7 @@
                 int minor;
             } compatible_versions[] = {
                 { VA_MAJOR_VERSION, VA_MINOR_VERSION },
+                { 0, 34 },
                 { 0, 33 },
                 { 0, 32 },
                 { -1, }