cad/irsim: adopt and update 9.7.116 => 9.7.118

* Take maintainership
* Flavourise with 3 flavours: lite, scheme (default) and tcl
+ Add LICENSE_FILE
+ Workaround building Tcl with clang17+
  See https://github.com/RTimothyEdwards/irsim/issues/7
* Use localbase:ldflags via USES
* Improve pkg-descr
* Lint Makefile, sort stances

Changelog: https://github.com/RTimothyEdwards/irsim/releases/tag/9.7.118

PR:		284856