Some configure scripts rely on pkgconfig to detect libedit, for instance
asterisk-13. Install the file so libedit can be used there as well.

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

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>

Signed-off-by: Daniel Salzman <daniel.salzman@nic.cz>

Signed-off-by: Daniel Salzman <daniel.salzman@nic.cz>