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>

Standard assignment is immediate expansion without any extraneous spacing, RFC822 compliant email addresses without any quotation marks and long git hashes

Signed-off-by: Stephen Walker <stephendwalker+github@gmail.com>

Signed-off-by: Stefan Weil <sw@weilnetz.de>

pps-tools builds on kernel 4.1, but instead of adding this kernel,
remove the check as all kernel versions currently supported by OpenWrt
are listed.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

Signed-off-by: Christian Pointner <equinox@spreadspace.org>

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>