Most users surely have upgraded Erlang.mk since then.

The tests were waiting for the test group to finish before
they could continue with the next test group. Now "core"
and "all" targets directly depend on individual test cases,
allowing parallel Make to get to the next tests quicker and
removing 1/3rd of the total run time.

  make check -j8 -k  5790,16s user 1207,08s system 627% cpu 18:35,49 total
  make check -j8 -k  6250,13s user 1326,77s system 972% cpu 12:59,16 total

Erlang.mk will no longer feature packages out of the box,
except for the applications that we implement plugins for
(such as erlydtl, proper or relx) and the projects I work
on that are also used to test Erlang.mk (cowboy and friends).

This is a breaking change. In most cases the fix is to add
a full dep_* line for the dependencies that were used as
packages before.

This should both be more solid and more secure.

Use the query_* equivalents instead.

This method dates back from the beginnings of Erlang.mk
and should not have been used for around a decade by now.
Adding "git" to the offending dep lines is enough to upgrade.

We use $1 instead of $(1) or $p instead of $(p) when possible,
except when building variable names (pkg_$(p)_name for example,
but also $(dep_fetch_$(1))).

This includes the SSL security fix for OTP-25+.