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more dTHX optimizations in /win32/*
In some places, where there is a higher risk of a NULL my_perl happening
at an unknown point in the future IMO new scopes were created. In other
places dTHXa(NULL) and aTHXa were used to avoid large whitespace changes.
win32_rename and win32_getenv I determined would have no benefit from
changing them. More context passing was added to static funcs called by
win32_kill and win32_waitpid removing the need to move the dTHXs in the
2 funcs.