(ITS#6937) Remove --enable-proctitle and strdup(optarg)

[h.b.furuseth@usit.uio.no]

Full_Name: Hallvard B Furuseth
Version: master, 2.4.25
OS: 
URL: 
Submission from: (NULL) (129.240.6.233)
Submitted by: hallvard


"configure --enable-proctitle" uses setproctitle/proctitle(), which
we no longer use.  So I'll remove that and liblutil/setproctitle.c.
That's the default implementation, which works by overwriting argv[].

That's got to be why we have strdup(optarg) instead of just optarg all
over the place.  So we can drop the strdup()s, which gets rid some
admittedly unimportant memory leak reports from program checkers.