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pmb: qemu-user-static from aport, not from Debian

Administrator requested to merge feature/qemu-user-static-from-source into master

Overview:

In order to execute foreign arch binaries on the host system, we are using the Linux kernel's binfmt_misc feature in combination with static builds of QEMU. Before this patch, the statically compiled QEMU binaries were taken from Debian (mostly because I did not realize that Alpine ships them as well). Now we can use the ones from the aport.

Benefits:

This allows us to easily update and patch the QEMU executables, we don't need to be in sync with Debian's versions anymore.

Alpine's package is more modular, so we can save some download, install, zap time, as well as disk space: setting up an armhf chroot with pmbootstrap took ~102 MB before, now it's ~18 MB.

Detailed changes:

  • Remove cross/qemu-user-static-repack aport
  • Add data/qemu-user-binfmt.txt with the binfmt_misc flags for ELF binaries of various arches (extracted from Debian's packaging)
  • When parsing that file, don't write verbose messages to pmbootstrap log anymore, only to the verbose log (can be enabled with pmbootstrap -v)
  • Rename pmb.parse.arch.alpine_to_debian() to ...alpine_to_qemu()
  • Rename arch_debian to arch_qemu

How to test:

$ pmbootstrap -y zap
$ pmbootstrap chroot -barmhf -- echo "hello world"
hello world

Fixes #1159 (closed).

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