Ref #14787
This really doesn't really fixes the problem of the symlink, but it
solves the progress of getting windows working.
TODO: find out if it's a bug from meason & make a feature request to
avoid symlinks or generate symlinks upon build and git ignore, but still
goes back to the issue of is this a bug or do we need to make a feature
requests.
Co-authored-by: John Ericson <git@JohnEricson.me>
Prior patches in 54dc5314e8
and 6db6190002 fixed the default
system double for i686 and ppc/ppc64. This also patch also covers
32 bit arm and mips. ARM cpu names are taken from host_machine.cpu()
for a lack of a better option, but host_machine.cpu_family() is
preferred, since that is supposed to be somewhat standard for cross
files. Endianness is handled correctly by looking at host_machine.endian().
This also updates the documentation to be up to date to how system cpu
is translated from the host_machine specification.
