Test whether filenames with paths longer than 260 (MAX_PATH on Windows)
are properly extracted from onefile build's CArchive.

On Windows, `pyi_path_fopen()` erroneously uses `MAX_PATH` (260)
instead of `PATH_MAX` (4096) to convert the filename to wide
characters, which causes `MultiByteToWideChar()` call in
`pyi_win32_utils_from_utf8()` to fail with
```
MultiByteToWideChar: The data area passed to a system call is too
small.
```
when we try to open a file with a long filename (> 260).

Due to lack of error checking, the resulting `wfilename` array ends
up with random content, and the `_wfopen()` call either fails
(in read-only mode) or creates a randomly-named file (in write
mode).