- Update to 21.2.0:
  * Features
    + The enableSessions argument to twisted.internet.ssl.CertificateOptions now
    + actually enables/disables OpenSSL's session cache. Also, due to
    + session-related bugs, it defaults to False. (#9583)
    + twisted.internet.defer.inlineCallbacks and ensureDeferred will now associate a contextvars.Context with the coroutines they run, meaning that ContextVar objects will maintain their value within the same coroutine, similarly to asyncio Tasks. This functionality requires Python 3.7+, or the contextvars PyPI backport to be installed for Python 3.5-3.6. (#9719, #9826)
    + twisted.internet.defer.Deferred.fromCoroutine has been added. This is similar to the existing ensureDeferred function, but is named more consistently inside Twisted and does not pass through Deferreds. (#9825)
    + trial now allows the @unittest.skipIf decorator to specify that an entire test class should be skipped. (#9829)
    + The twisted.python.deprecate.deprecatedKeywordParameter decorator can be used to mark a keyword paramater of a function or method as deprecated. (#9844)
    + Projects using Twisted can now perform type checking against a Twisted
    + installation, for example using mypy. (#9908)
    + twisted.python.util.InsensitiveDict now fully implements MutableMapping. (#9919)
    + Python 3.8 is now tested and supported. (#9955)
    + Support a coroutine function in twisted.internet.task.react (#9974)
    + PyPy 3.7 is now tested and supported. (#10093)
  * Bugfixes
    + twisted.web.twcgi.CGIProcessProtocol.processEnded(...) now handles an already-finished request, for example when request.connectionLost(...) was called previously. (#9468)
    + Twisted's dependency on PyHamcrest has been moved from the base package to the new "test" extra. Consequently the test extra must be installed for Twisted's test suite to pass. (#9509)
    + Fixed serialization of timedelta, date, and time objects in twisted.spread. (#9716)
    + twisted.internet.asyncioreactor.AsyncioSelectorReactor now raises an exception if instantiated with an event loop which is not compatible with asyncio.SelectorEventLoop. This fixes the AsyncioSelectorReactor in Python 3.8+ on Windows, where in bp-34687 the default Windows asyncio event loop was changed to ProactorEventLoop. Applications that use AsyncioSelectorReactor on Windows with Python 3.8+ must call asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy()) before instantiating and running AsyncioSelectorReactor. (#9766)
    + twisted.internet.process.registerReapProcessHandler and ._BaseProcess.reapProcess will no longer raise a TypeError when processing a None PID (#9775)
    + INotify will close its file descriptor if a directory is automatically removed by twisted from the watchlist because it's deleted, avoiding orphaned filedescriptors. (#9777)
    + DelayedCall.reset() is now working properly with asyncioreactor (#9780)
    + AsyncioSelectorReactor.seconds() now correctly returns an epoch time. (#9787)
    + The _connDone parameter has been removed from twisted.internet.abstract.FileDescriptor.loseConnection()'s signature in order to match the signature in the base class twisted.internet._newtls.ConnectionMixin loseConnection(). (#9849)
    + The Gtk3 reactor now runs on Wayland-only sessions (#9904)
    + Descriptive error messages from twisted.internet.error are now present when running with 'python -OO'. (#9918)
    + Comparator methods such as eq() now always return NotImplemented for uncomparable types. (#9919)
    + When installing Twisted it now requires a minimum Python 3.5.4 version to match the version used with automated testing. This is the minimum Python version that we know that Twisted works with. (#10098)
- Drop patches no-pygtkcompat.patch, python-38-hmac-digestmod.patch,
  python-38-no-cgi-parseqs.patch, twisted-pr1369-remove-pyopenssl-npn.patch,
  twisted-pr1487-increase-ffdh-keysize.patch and
  test-mktime-invalid-tm_isdst.patch as they have been merged.
- Refresh other patches.
- Add no-cython_test_exception_raiser.patch to avoid another dependency.
- Update URL and make use of sitelib, not sitearch macros

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