Add a missing "#undef" for the limited API target.
Add a missing "#undef" for the limited API target.

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