[Bug 216143] lang/rust, devel/cargo: generate bootstraps for Tier2 architectures via cross-compilation

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216143

--- Comment #28 from commit-hook at freebsd.org ---
A commit references this bug:

Author: dumbbell
Date: Sat Jun 17 14:44:30 UTC 2017
New revision: 443777
URL: https://svnweb.freebsd.org/changeset/ports/443777

Log:
  lang/rust: Enable on FreeBSD/aarch64 + various fixes

  This port now uses an unofficial bootstrap of Rust 1.17.0 and Cargo
  0.18.0 for FreeBSD/aarch64. Here are my notes to create this boostrap:
  https://gist.github.com/dumbbell/b587da50ef014078da9e732a4331ebad

  The port's Makefile was changed to:
      - allow to override the versions and directories of the bootstrap
        archives;
      - patch the bootstrap script and manifest with those
        versions/directories.

  Beside changes to support FreeBSD/aarch64, the port received the
  following fixes:
      - Pass python path to the configure script.
      - Fix and simplify the extraction of rust-std bootstrap by re-using
        existing variables.
      - Make sure tar(1) doesn't produce sparse file entries when it
        recreates the rust-std bootstrap because Python 2's tarfile module
        doesn't support them (PR 219842).

  PR:           216143, 219842
  Differential Revision:        https://reviews.freebsd.org/D10857

Changes:
  head/lang/rust/Makefile
  head/lang/rust/distinfo
  head/lang/rust/files/extra-patch-ino64

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