Rollup merge of #79573 - he32:master, r=jonas-schievink

Rollup merge of #79573 - he32:master, r=jonas-schievink

Update with status for various NetBSD ports.

The NetBSD ports of rust to aarch64, armv7*, i686, and powerpc**
all both build and run.  Status is as of rust 1.47.0.

*) Natively requires repeated successive build attempts (`rustc` is
   such a resource pig VM-consumption-wise), or run in a chroot
   on an aarch64 host where the available VM space is 4GB instead
   of the native 2GB.
**) Powerpc either requires `-latomic` in a directory searched by
   default by `ld` or to be built within pkgsrc which has a patch and
   support package to tackle this issue.