fix Makefile chmod (644)
replace MD5SUM with HASH
add PKG_MIRROR_HASH when PKG_SOURCE_PROTO:=git

(PKG_SOURCE_PROTO:=svn tarballs are not reproducible for now)

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Previous build was missing module socket.unix that is required for
interaction with Unix domain sockets and is distributed in a separate
shared library. This commit adds the file to the created package.

Signed-off-by: Jan Čermák <jan.cermak@nic.cz>

Signed-off-by: W. Michael Petullo <mike@flyn.org>