Windows support needs work

While it basically works, PyPy's support for windows is not great:


- The winconsoleio crashes and has been disabled (the winconsoleio-debug 
branch was last touched in July 2020), leaving PyPy with a suboptimal 
console experience. The unicode rendering does not work properly, so 
things like "rich" print out random ascii art. [0]


- There is a problem with the posix interfaces. Things like 
os.listdir(dir-as-bytes) return slightly different results on CPython 
and on PyPy. This has made it difficult to support the missing 
`os.symlink` and `os.readlink`, which are becoming more popular as 
support for symlinks in windows improves. [1]


- The only reason we still have unicode strings in RPython is to support 
windows (see  uses of space.realunicode_w). This makes even starting a 
RPython3 port much more difficult. It probably also slows down windows 
performance.


- The work to create a windows installer was never finished (the 
windowsinstaller branch was last touched in Nov 2019)


- There are builds of PyPy on windows at conda-forge, but they seem to 
be almost broken [2]


How can we find contributors or sponsors to improve PyPy support for 
windows?

Matti


[0] issues 2999, 3767, 3768,

[1] issues 3225, 2753, 3506, 3535, 3641, 3479, 3434

[2] https://github.com/conda-forge/pypy3.6-feedstock/issues/101

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