sysutils/intel-pcm-devel: delete port

  sysutils/intel-pcm-devel became quite obsolte once sysutils/intel-pcm is
  now pretty much following a constant and stable update cycle, so users of
  the -devel version are encouraged to switch to it.

  If you still have sysutils/intel-pcm-devel installed, please delete it from
  your system and install sysutils/intel-pcm instead:

    # pkg delete sysutils/intel-pcm-devel
    # pkg install sysutils/intel-pcm