st/va: add VAAPI HEVC decode support

Signed-off-by: Boyuan Zhang <boyuan.zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Leo Liu <leo.liu@amd.com>
diff --git a/configure.ac b/configure.ac
index 5aa19a5a..3f15881 100644
--- a/configure.ac
+++ b/configure.ac
@@ -81,7 +81,7 @@
 LIBUDEV_REQUIRED=151
 GLPROTO_REQUIRED=1.4.14
 LIBOMXIL_BELLAGIO_REQUIRED=0.0
-LIBVA_REQUIRED=0.35.0
+LIBVA_REQUIRED=0.38.0
 VDPAU_REQUIRED=1.1
 WAYLAND_REQUIRED=1.2.0
 XCB_REQUIRED=1.9.3