Pre-release 5.19-rc1

Since the <kernel.org> site is currently unmaintained, and my own
<http://www.alejandro-colomar.es/> server is insecure, people
can't possibly get trusted and up-to-date manual pages.

Let's release a signed tag, so that people can make sure that my
repo is really owned by me, at least up to the tag.

I'm not releasing a tarball, nor a changelog.  Just a git tag.
But it should be trivial to produce a tarball using the Makefile.
I need to learn how to produce a changelog, before doing an actual
release.
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