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>

NEWS has these comments:

Noteworthy changes in release 1.4.18 (2016-12-31) [stable]
* Diagnose --word-regexp as unsupported if it was not configured.
* Preliminary support for OS/2.
* A number of portability improvements inherited from gnulib.

SHA256SUM is used as package checksum

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Switch to xz tarball

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

GNU M4 is a prerequisite to run autoconf and automake.

This patch packages the macro processor.

This is a prerequisite for packaging autoconf and automake.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

[Fixed commit summary according to our best-practise]

Signed-off-by: Michael Heimpold <mhei@heimpold.de>