munge: new version, local state path, misc (#15307)

* Add version 0.5.14
* Add variant to allow setting the localstatedir: See below
* Add bzip2 dependency
* Add myself to maintainers (I just think, I can care for
  this package)

About localstatedir:

munge has a server and a client.
They communicate via unix domain sockets.
This socket is in PREFIX/var.
This package provides the client, the server, and
development part (headers, libraries).

Let's assume one has the server part installed as a system
package.  This generally is a good idea, so that the server
gets started during boot. This means, that the socket is in
the system's /var.

If one now wants to use the client part (library!) via
spack, one has a problem: spack's munge looks in
SPACK-PACKAGE-PREFIX/var for the socket.

There needs to be a way to let the spack installed package
use the system's socket.

So add a variant to override the path during build:
localstatedir=/var.

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