GH-2564: Enable "binding" directive by default.
GH-2564: Enable "binding" directive by default.

da-woods/cython,scoder/cython,scoder/cython,cython/cython,scoder/cython,da-woods/cython,da-woods/cython,da-woods/cython,cython/cython,cython/cython,scoder/cython,cython/cython