Also use default defintions for PKG_SOURCE_SUBDIR, PKG_SOURCE

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Replace *MD5SUM with *HASH, replace MD5 hashes with SHA256

Signed-off-by: Felix Fietkau <nbd@nbd.name>

* Change git packages to xz
* Update mirror checksums in packages where they are used
* Change a few source tarballs to xz if available upstream
* Remove unused lines in packages we're touching, requested by jow- and blogic
* We're relying more on xz-utils so add official mirror as primary source, master site as secondary.
* Add SHA256 checksums to multiple git tarball packages

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

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

Signed-off-by: Steven Barth <steven@midlink.org>

SVN-Revision: 43151

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 38023

SVN-Revision: 36554

SVN-Revision: 36552