devel/tmake: Deprecate and set expiration date to 2023-12-31

Last release of this fork was in 2004, superseded by qmake around the
same time

References:
http://qtandeverything.blogspot.com/search/label/tmake
https://www.qt.io/blog/2018/05/24/porting-from-qt-1-0

PR: 274649
Approved by: portmgr (maintaimer timeout, 3+ weeks)