[packages/dssim2] (5 commits) ...BRs for tar.xz source

[atler]

Summary of changes:

  5e1f7c6... use rust macros (*)
  a184185... BR: nasm on x86 (for avx/sse asm in mozjpeg) (*)
  2726e75... attempt at adding support for x32 target in nasm compiled s (*)
  a3816de... macros for %cargo* (*)
  e2c9d3c... BRs for tar.xz source (*)

(*) This commit already existed in another branch; no separate mail sent