[7.x][ML] Changes to allow native compilation on ARM Macs #1664
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This allows native compilation on a Mac containing the
Apple M1 CPU.
PR builds will currently NOT test this platform, nor even
check compilation for it. Release manager will not build
it either. Still, it is a step in the right direction to
be able to compile locally for it.
Cross compilation for this platform is still NOT possible.
This can be investigated in a followup PR. (Supporting
this actually requires considerable changes to the cross
compilation framework, as it currently contains a quite
deeply embedded assumption that macOS is x86_64 only.)
The last dregs of Linux MUSL port code are also removed.
(Most support for MUSL was removed previously, but a few
bits were missed.)
Backport of #1651