[Toybox] The last working musl-cross-make version is commit aacd84ed2cd7.

[Rob Landley]

You may notice toybox's scripts/mcm-buildall.sh running against recent versions
of https://github.com/richfelker/musl-cross-make hasn't been producing working
m68k or s390x compilers (no kernel headers were installed).

I bisected it to commit 38e52db8358c where Rich resurrected Mariusz Mazur's
out-of-tree kernel headers package from 2005 (ala
https://landley.net/notes-2005.html#17-03-2005) from before "make
headers_install" was invented, and decided doing that _again_ was a good idea.

The commit before that builds them both fine.

Rob