fix pyflakes warnings in src/sage/misc/cython.py

[seblabbe]

From #33029:

src/sage/env.py:32:1 'sage' imported but unused
src/sage/misc/cython.py:295:9 'setuptools' imported but unused
src/sage/misc/sagedoc.py:791:9 'sage.all' imported but unused
src/sage/misc/sagedoc.py:969:5 local variable 'html_results' is assigned to but never used

Component: misc

Author: Sébastien Labbé

Branch/Commit: 201dea8

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/34061

[seblabbe]

Commit: b48774a

[seblabbe]

Branch: u/slabbe/34061

[seblabbe]

New commits:

b48774a

34061: fix pyflakes warning in misc/cython.py

[seblabbe]

Author: Sébastien Labbé

[seblabbe]

comment:2

I fixed the one in misc/cython.py, but left the other unchanged because I don't think it is safe to change them.

[mkoeppe]

Changed branch from u/slabbe/34061 to u/mkoeppe/34061

[mkoeppe]

Changed commit from b48774a to 201dea8

[mkoeppe]

Reviewer: Matthias Koeppe

[mkoeppe]

New commits:

201dea8

src/sage/misc/cython.py: Remove outdated comment

[vbraun]

Changed branch from u/mkoeppe/34061 to 201dea8