[varnishcache/varnish-cache] 83aa54: Use correct function for setting thread name.

[Lasse Karstensen]

  Branch: refs/heads/master
  Home:   https://github.com/varnishcache/varnish-cache
  Commit: 83aa5402eedbd27f46b382a2742efc404629e8f0
      https://github.com/varnishcache/varnish-cache/commit/83aa5402eedbd27f46b382a2742efc404629e8f0
  Author: Lasse Karstensen <lkarsten at varnish-software.com>
  Date:   2015-11-26 (Thu, 26 Nov 2015)

  Changed paths:
    M bin/varnishd/cache/cache_main.c
    M config.phk
    M configure.ac

  Log Message:
  -----------
  Use correct function for setting thread name.

Correct typo that checked for pthread_set_name_np() instead of
pthread_setname_np().

Thread names should now be visible in /proc/CHILDPID/tasks/*/comm on
Linux systems.