Remove second parser module example; it referred to non-readily-available example files, and this kind of discovery is much better done with the AST nowadays anyway.

#459007: merge info from PC/getpathp.c and using/windows.rst to document the forming of sys.path under Windows.

as (~0U) on NetBSD which was causing it to appear as -1 when used as
a signed int for _multprocessing.SemLock.SEM_VALUE_MAX.  This works
around the problem by substituting INT_MAX on systems where it appears
negative when used as an int.

Fix the test if the native filesystem encoding is not utf-8 (eg. cp1250 on
Windows).