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

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

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

SVN-Revision: 47049

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

SVN-Revision: 46434

Bump GNU patch in tools from 2.7.1 to 2.7.5.
Change download URL to use @GNU alias.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

SVN-Revision: 44760

following patch allows to build images for Qemu ARM on
OpenBSD 5.2 amd64 and FreeBSD 9.1 amd64.

Mostly small pieces of code changes to get things right on the
specific platform.

Updated the README to describe better, which tools on the host
are required. Added some kind of prepare scripts to install needed
tools on BSD via packages.

Signed-off-by: Waldemar Brodkorb <mail@waldemar-brodkorb.de>

SVN-Revision: 35900