-Fix [FS#5908]: Don't redraw the link graph overlay if it's empty (MJP)

git-svn-id: http://svn.openttd.org/trunk@26338 6aa0318a-3be1-0310-93fa-89fd2396df07
-Revert (r26305): Accidental changes to the VS9.0 solution file disabling the x64 build.

git-svn-id: http://svn.openttd.org/trunk@26339 6aa0318a-3be1-0310-93fa-89fd2396df07