That means instead of having a single hostdir/repocache, there
is now hostdir/repocache-$XBPS_TARGET_MACHINE.
This solves multiple problems:
1) When cross-compiling for different architectures and the repos
for host and target differ, you will not get signature/checksum
conflicts for noarch packages.
2) The clean-repocache command will not delete noarch packages that
don't belong to that architecture.
3) Clean mixing of glibc and musl masterdirs with the same hostdir
is now possible; even when building natively, the musl masterdir
will use its repocache-foo-musl, while the glibc masterdir will
use repocache-foo.
[ci skip]
f0e852c511