* update tools/common

* disable performance-enum-size lint

* add toolchain/nx-decomp-tools-binaries

Subrepos are too fragile and break if there are changes in the upstream
repo and in the main repo, or after doing a rebase/merge

git subrepo clone https://github.com/open-ead/sead lib/sead

subrepo:
  subdir:   "lib/sead"
  merged:   "1b66e825d"
upstream:
  origin:   "https://github.com/open-ead/sead"
  branch:   "master"
  commit:   "1b66e825d"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "2f68596"

git subrepo clone (merge) https://github.com/open-ead/nnheaders lib/NintendoSDK

subrepo:
  subdir:   "lib/NintendoSDK"
  merged:   "9ee21399f"
upstream:
  origin:   "https://github.com/open-ead/nnheaders"
  branch:   "master"
  commit:   "9ee21399f"
git-subrepo:
  version:  "0.4.3"
  origin:   "ssh://git@github.com/ingydotnet/git-subrepo"
  commit:   "2f68596"

git subrepo clone https://github.com/open-ead/agl lib/agl

subrepo:
  subdir:   "lib/agl"
  merged:   "7c063271b"
upstream:
  origin:   "https://github.com/open-ead/agl"
  branch:   "master"
  commit:   "7c063271b"
git-subrepo:
  version:  "0.4.3"
  origin:   "ssh://git@github.com/ingydotnet/git-subrepo"
  commit:   "2f68596"

git subrepo clone https://github.com/open-ead/EventFlow lib/EventFlow

subrepo:
  subdir:   "lib/EventFlow"
  merged:   "c35d21b34"
upstream:
  origin:   "https://github.com/open-ead/EventFlow"
  branch:   "master"
  commit:   "c35d21b34"
git-subrepo:
  version:  "0.4.3"
  origin:   "ssh://git@github.com/ingydotnet/git-subrepo"
  commit:   "2f68596"

Using musl is required to match several functions that use <math.h>
floating point functions like isnan.

This also removes a dependency on devkitA64. We previously only needed
it because Clang insisted on using GCC to link the final executable
owing to the use of a "bare metal" target like aarch64-none-elf.
We can make Clang invoke the linker itself by using a Linux target.