libao: add hash

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libao/libao.hash

@@ -0,0 +1,2 @@
+# From http://downloads.xiph.org/releases/ao/SHA256SUMS.txt
+sha256	03ad231ad1f9d64b52474392d63c31197b0bc7bd416e58b1c10a329a5ed89caf	libao-1.2.0.tar.gz