package/erlang-p1-xml: add .hash file

Similar to jquery-keyboard, it seems the erlang-p1-xml tarball on the
autobuilder is corrupt.  Fix it by adding a .hash file so it falls back to our
s.b.o mirror.

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/erlang-p1-xml/erlang-p1-xml.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256 4c163c5b9572baa93eb97e03544db57dc751c7995a5279081a0d56f5fdaa2521 erlang-p1-xml-1.1.1.tar.gz