new config.in stuff for xfce

[Edscott Wilson García]

 Hi,

  I just uploaded a new config.in and asociated files for xfce-dev tree. This 
configure does the check for gtk2 and sets up the makefiles accordingly. It 
uses the same ./autogen.sh as the xfce-stable tree for initial setup. So far 
it only does the makefiles for xfbd, xfdiff, xfsound and xfumed. 

 xfbd2, xfdiff, and xfumed 2compile without problems, but xfbdmgr2 and 
xfsound2 fail to compile. Could you check on them, Jasper, when you get back 
from your holiday?

Edscott