x11/cde-25: Update to 2.5.1

2.5.1 minor but what our upstream consider significant enough to roll
a new release including:

• load appropriate xterm font
• update ksh93 used as a basis to implement dtksh to 1.0.3

Though dtksh is based on ksh, it implements an API that allows ksh shell
scripts access to CDE functions.

(cherry picked from commit 268bf3e3abd429a76a30bd42899a4b4241f8e058)