Do not export PMS variables in EAPI 9 (or if FEATURES=-export-pms-vars)HEADmaster

Instead of passing PMS variables as part of the process environment,
we pass them via a file that is later sourced by the ebuild's
bash.

Since, for example, A is usually the greatest contributor to the
process environment, removing it from the process environment
significantly avoids running into MAX_ARG_STRLEN when spawning a new
child process.

This means that A and other PMS variables are no longer exported in
the ebuild and hence unavaiable to child processes. However, A is
mostly used as part of the default_src_unpack function and there A
does not need to be exported.

This started as a change that only unexported A, but was later
extended to most PMS variables as suggested by ulm in
https://bugs.gentoo.org/721088#c23.

Thanks to Zac Medico for helpful input on this change, and to Eli
Schwartz for suggesting that (bash) helpers should simply source the
environment file introduced by this change.

Closes: https://bugs.gentoo.org/721088
Signed-off-by: Florian Schmaus <flow@gentoo.org>
Closes: https://github.com/gentoo/portage/pull/1407
Signed-off-by: Mike Gilbert <floppym@gentoo.org>

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