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Windows has this, and so do all other live platforms according to the buildfarm; it's been required by POSIX since SUSv2. So remove the configure probe and tests of HAVE_WCHAR_H. This is part of a series of commits to get rid of no-longer-relevant configure checks and dead src/port/ code. I'm committing them separately to make it easier to back out individual changes if they prove less portable than I expect. Discussion: https://postgr.es/m/15379.1582221614@sss.pgh.pa.us