bpo-45453: Fix test_embed.StdPrinterTests #28916
Merged
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test_embed.StdPrinterTests now always use the file descriptor 1 for
stdout, rather than using sys.stdout.fileno().
PyFile_NewStdPrinter() does crash if the parameter is not 1 or 2.
Fix also a few pyflakes warnings: remove unused import and variables.
https://bugs.python.org/issue45453