libva: add tarball hash

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libva/libva.hash

@@ -0,0 +1,2 @@
+# From http://lists.freedesktop.org/archives/libva/2014-September/002746.html
+sha1	5704e728aa59a748cf820ac2a5efe0764f6e4b01	libva-1.4.0.tar.bz2