Launch vncconfig directly from vncserver, not from xstartup. Justification: vncconf...

Launch vncconfig directly from vncserver, not from xstartup.  Justification:  vncconfig is necessary to enable basic functionality of the TigerVNC system (clipboard transfer, most notably.)  It isn't always going to be in the PATH, and in fact, there might be more than one version of it on the system (for instance, a version from RealVNC in /usr/bin and a version from TigerVNC in /opt/TigerVNC/bin.)  If it is desirable to disable vncconfig under certain circumstances, then I would suggest adding a command-line option to vncserver to accomplish that.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4709 3789f03b-4d11-0410-bbf8-ca57d06f2519