[issue16501] deprecate RISCOS "support"

[Christian Heimes]

Christian Heimes added the comment:

I've removed the remaining ifdef from the sys.flags code, site.py and tests. The remaining code lines are 3rd party code. I'm not sure about the last two lines.

$ find -name '*.[ch]' -or -name '*.py' | xargs grep -i riscos
./Modules/zlib/zutil.h:#if defined(_BEOS_) || defined(RISCOS)
./Modules/zlib/example.c:#if defined(VMS) || defined(RISCOS)
./Modules/zlib/minigzip.c:#ifdef RISCOS
./Objects/floatobject.c:     * systems raise an exception then (RISCOS was mentioned as one,
./Lib/test/test_email/test_email.py:        eq(part2.get_content_type(), 'application/riscos')
./Mac/Tools/bundlebuilder.py:    'org.python.core', 'riscos', 'riscosenviron', 'riscospath'

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nosy: +christian.heimes

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<http://bugs.python.org/issue16501>
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