rpm: update 4.18.1 -> 4.19.1

rpm: update 4.18.1 -> 4.19.1

Upstream has replaced autoconf with cmake, which necessitates a rewrite of the
recipe and available options, and a rebase to cmake of
0001-Do-not-hardcode-lib-rpm-as-the-installation-path-for.patch

Correct a mistake in 0001-Do-not-read-config-files-from-HOME.patch :
the patch was removing the NULL marker at the end of function arguments,
and 0002-Add-support-for-prefixing-etc-from-RPM_ETCCONFIGDIR-.patch
was restoring it (in addition to the actual change the patch was making).
Now both patches preserve the NULL terminator.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>