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>

quasselc is a library providing an API to access a Quassel core
in pure C. Quassel is a distributed IRC client where the core
can run independently of the interface(s). This library provides
a C API for programs that wish to implement the Quassel protocol.

Signed-off-by: Ben Rosser <rosser.bjr@gmail.com>