So we can get rid of the Alpine patch[1]

[1] https://git.alpinelinux.org/aports/tree/community/openrc-settingsd/use-profiled-instead-of-envd.patch

With modern openrc we can use the defaults and just set a few variables.
Also we can remove NTP_SERVICE variable since the user can set it very
easy via OPENRC_SETTINGSD_OPTS variable.

Stop using compiled-in location for pidfile, and instead pass path to
pidfile on the command line. If nothing is passed, we won't create a
pidfile.

Only Gentoo seems to use the /etc/conf.d/hostname style, implement
support for the more standard /etc/hostname.

Read the values from machine-info file and expose them on D-Bus.

With meson now available there's no need to keep this around. Remove it.

The runscript shebang is deprecated, so use openrc-run instead.

The /etc/dbus-1/system.d/ path is deprecated for a while for
system-installed packages and /usr/share/dbus-1/system.d/ should be used
now.

The autotools build system uses "-include ./config.h" which makes the
macros defined in config.h available already without including config.h
directly. But for meson build system this isn't the case so we need to
move config.h before any #if that we have below.

Remove unused label and remove double assignment of entry variable.

We check in guess_icon_name for the configured chassis so we must set
the chassis value first.

Convert the existing guess_icon_name method to guess the chassis value
and build the icon name based on that.

Previously if the existing file didn't end with a newline then two shell
entries would be written without any separator to the file leading to a
broken file.

Otherwise the timezone couldn't be read correctly by users other than root

Previously we always tried to write the contents of the file in
/usr/share/zoneinfo to /etc/localtime, but that doesn't work if it
doesn't exist or if /etc/localtime is a symlink. As such, we should just
make it a symlink if it doesn't exist or already is one.

Additionally the AC_SUBST call isn't needed since Autotools v0.24