Solaris 10: define SUNOS_NO_IFADDRS to make libuv compile correctly

AIX: fix compilation of libuv

Fix AttributeError when wrapping a FileObject around already-opened text streams

Fixes #1542

Update tblib version for pytest compatibility

Hopefully this is why the build stages aren't running for https://travis-ci.org/github/gevent/gevent/builds/660126948?utm_medium=notification&utm_source=github_status (#1541)

Correct a typo in patched_tests_setup.py

Remove the deprecated magic proxy gevent.signal.

Leave behind the actual module gevent.signal, and the callable gevent.signal_handler.

Fixes #1596

Rework the way the in-place patcher works.

It now handles multiple imports better and doesn't pollute the namespace of an original module object if it happened to be pre-imported.

Fixes #1526

Packaging updates: use common_utility_include_dir for Cython, and don…

Packaging updates: use common_utility_include_dir for Cython, and don't install/include generated .c/.h files in wheels

docs/api/gevent.rst: fix typo

Refactor test__all__ to make it easier to spot errors. PyPy 7.2 on Windows has a failure with it; this won't fix it but is the first step. Make PyPy on windows non-optional so we catch such failures easier.