Patch made against cvs version 220.127.116.11 allowing to compile again without Tk
When expect is only intented to run gcc test, that make no sense to require Tk installed.
I have not restored --with-x=no but changed existing --with-tk to support variant --with-tk=no.
If that's desirable, I could rework my patch to use again --with-x=no.
I have not changed the indentation despite having added one if fi level in 3 m4 macro.
That make the patch much smaller and more readable. I could update the indentation at maintainer request.