postgresql: add hash

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/postgresql/postgresql.hash

@@ -0,0 +1,2 @@
+# From https://ftp.postgresql.org/pub/source/v9.4.0/postgresql-9.4.0.tar.bz2.sha256
+sha256	7a35c3cb77532f7b15702e474d7ef02f0f419527ee80a4ca6036fffb551625a5	postgresql-9.4.0.tar.bz2