workstation ebuild enhancements

o Capture media-libs/tiff:3 dependency which only revealed itself to me
  now that this library became slotted

o Implement the vmware-vim-cmd personality of vmware-hostd.  This has
  apparently been missing upstream for quite some time now which means
  the openrc init scripts have not been working right.  To be clear,
  by "personality" I just mean a symlink that presumably makes the tool
  behave differently (probably like vSphere's vim-cmd; a less confusing
  name for the tool would have been workstation-vim-cmd).

o Recent systemd totally pukes on my vmware-workstation-server.service
  script.  Fix the name problem (PidFile -> PIDFile) and drop the bash
  subshell usage in my implementation of ExecStop (for the life of me
  I cannot figure out the correct syntax to make it work.  Fuck you,
  systemd, for your shitty first-draft manpages and complete lack of
  usable documentation resources not targeted to first-time end-users
  (a bunch of assholes hanging out on IRC is apparently the official
  technical documentation resource... insufficient, imo).

Signed-off-by: Gregory M. Tuner <gmt@be-evil.net>