Log Message:
xdm: update to 1.1.16.

This release fixes a failure to build with the recent libXaw 1.0.16 release
due to a change introduced in xdm 1.1.15 to address gcc 14 build issues.

Alan Coopersmith (2):
      Define _CONST_X_STRING when including Xaw & Xt headers
      xdm 1.1.16