mesa3d-demos: add hash file

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

package/mesa3d-demos/mesa3d-demos.hash

@@ -0,0 +1,2 @@
+# Locally calculated after checking pgp signature
+sha256	e4bfecb5816ddd4b7b37c1bc876b63f1f7f06fda5879221a9774d0952f90ba92	mesa-demos-8.2.0.tar.bz2