Fix #77372: Retain full path of files for directory uploads (#6917)

To fix https://bugs.php.net/bug.php?id=77372 and improve support of `<input type="file" name="files" multiple webkitdirect

Fix #77372: Retain full path of files for directory uploads (#6917)

To fix https://bugs.php.net/bug.php?id=77372 and improve support of `<input type="file" name="files" multiple webkitdirectory>` I introduced another item to the `$_FILES` array called `full_path`, containing the full filename, as supplied by the user-agent.

Co-authored-by: Björn Tantau <bjoern@bjoern-tantau.de>

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