Avoid fork bomb caused by native compilation

Avoid fork bomb caused by native compilation

This upstream patch has been incorporated to fix the problem:

  Prevent potential native compilation infinite recursions

  * lisp/emacs-lisp/comp.el (comp-no-spawn): New var.
  (comp-subr-trampoline-install, comp-final, comp-run-async-workers)
  (comp--native-compile): Update.

Origin: upstream, commit: 1a8015b83761f27d299b1ffa45fc045bb76daf8a
Bug-Debian: https://bugs.debian.org/1017817
Bug-Debian: https://bugs.debian.org/1017845
Forwarded: not-needed

Gbp-Pq: Name 0010-Avoid-fork-bomb-caused-by-native-compilation.patch