* Fix hardcoded `armhf` in pmb/aportgen/binutils.py
* Generate aports: `binutils-aarch64`, `musl-aarch64`, `gcc-aarch64`
* Distccd: Remember the cross-compiler architecture (currently armhf
or aarch64), that the current distccd is running as, and restart
distccd with the correct architecture, in case a different arch
is needed than what it is currently running as. (Depending on the
cross-compiler arch, the PATH variable gets adjusted before
starting distccd)
* Testcases: add aport generation for aarch64, add cross-compiling
to aarch64
* pmb/parse/arch.py: Add aarch64 to the mapping
* automatically find the chroot binary on Debian, even if it is not
in the user's PATH
* don't use subprocess.run anymore (remove related testcase, that explicitly
checked for subprocess.run usage, and used recursive globbing, another
post 3.4 Python feature, for the checks. A similar case can be added in the
future, but right now it's more important to get Debian 3.4 working and all
PRs are reviewed anyway.)
* pytest fixtures: don't use the newer "yield" feature, as this is only
supported in a newer version of pytest, than provided on Debian Jessie
From manually testing, most stuff works in Debian Jessie. However, the
testsuite does not run through - creating an empty .tar.gz with Python
fails for some reason (this is done in test_apk_static.py).
