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>

All packages should now properly depend on all perlbase- and perl- packages
they need.

Signed-off-by: Marcel Denia <naoir@gmx.net>

Signed-off-by: Marcel Denia <naoir@gmx.net>