munge: Fix installation paths

Removing `src/etc/Makefile` is overly intrusive, as the file is responsible
for installing pkg-config file.  The issue when it would try to write to
the specified out-of-store paths can be easily resolved by overriding them
to ones within `$out` during installation.

Also set `sysconfdir` path properly to allow configuring it with `environment.etc`.
There should be no problem with missing files, as nothing was installed
to `$out/etc` previously either, other than an empty `munge` directory.

`localstatedir` is used at runtime and installation creates empty directories in `$out`.
But since we do not merge those directories into running system, having them in `$out`
serves no purpose.  Creation of `StateDir` and logging is handled by systemd anyway.

`runstatedir` defaults to `$(localstatedir)/run` but that has long been
deprecated in favour of `/run`, so let’s fix that as well.

`pkgconfigdir` and `sysconfigdir` (not to be confused with the standard `sysconfdir`)
rely on FHS for proper detection and `systemdunitdir` tries to run `systemd --version`,
let’s just hardcode them.  `sysconfigdir` is mentioned in the newly installed
and currently unused `munge.service` – a file within is loaded as `EnvironmentFile`
when it exists so let’s override the path for installation.  This will again make it
so the file can serve as a template in `$out` but the service will load it from `/etc`.

The last two options are installation-only so we can directly set them to `$out` subdirectories.

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