Log message:
Mass-change BUILD_DEPENDS to TOOL_DEPENDS outside mk/.

Almost all uses, if not all of them, are wrong, according to the
semantics of BUILD_DEPENDS (packages built for target available for
use _by_ tools at build-time) and TOOL_DEPEPNDS (packages built for
host available for use _as_ tools at build-time).

No change to BUILD_DEPENDS as used correctly inside buildlink3.

As proposed on tech-pkg:
https://mail-index.netbsd.org/tech-pkg/2023/06/03/msg027632.html

Log message:
Fix packages that use GITSUB_MODULES on SunOS and possibly others

This is annoying, but for now we must always explicitly combine
GITHUB_SUBMODULES with EXTRACT_USING+=bsdtar.

This is because mk/fetch/github.mk uses OPTS_TAR=--strip-components=1
and that is not supported by nbtar(pax), which is the default pkgsrc
tar on some platforms. We cannot override EXTRACT_USING in github.mk
because that is too late.

We should switch all platforms to bsdtar and retire pax.

Log message:
sysutils: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

Log message:
sysutils: Remove SHA1 hashes for distfiles

Log message:
m1n1: Needs ImageMagick for "convert" at build-time