Remove broken experimental package gambit #30156
Description
It is not compatible with python 3.
https://github.com/mkoeppe/sage/runs/876312037
[gambit-15.1.1.p0] make[2]: Leaving directory '/sage/local/var/tmp/sage/build/gambit-15.1.1.p0/src'
[gambit-15.1.1.p0] Traceback (most recent call last):
[gambit-15.1.1.p0] File "setup.py", line 32, in <module>
[gambit-15.1.1.p0] m.Extension.__dict__ = m._Extension.__dict__
[gambit-15.1.1.p0] AttributeError: attribute '__dict__' of 'type' objects is not writable
[gambit-15.1.1.p0] Error installing Python API
[gambit-15.1.1.p0]
Another failure report: cygwin linking trouble - https://groups.google.com/g/sage-devel/c/HisDSCo7zlk/m/dAs5K5OrBwAJ
Upstream looks unattended. The last releases are from 2017.
https://github.com/gambitproject/gambit/issues
http://www.gambit-project.org/
https://repology.org/project/gambit-game-theory/versions
Previous tickets: #24840, #24012
CC: @dimpase @theref @kcrisman @nathanncohen @drvinceknight @tscrim @jhpalmieri
Component: packages: experimental
Issue created by migration from https://trac.sagemath.org/ticket/30156