[PATCH] net/samba420: Unbreak samba 4.20

[kiwi]

Summary

net/samba420: Unbreak samba 4.20

This fix the 0100 patch to make file creation working. The
patch has been updated to not alter too much the patch, to
make it working.

This make now samba 4.20 working even if it has only be tested
on Windows and MacOS with basic functionality.

PR:     284623
Approved by:    0mp (mentor)
Approved by:    samba (kiwi)
Sponsored by:   Klara, Inc.

Test Plan

Tested by the author of the patch on his systems. It seems to works.
Tested by @kiwi on Mac OS 15.5 as basic client. VFS:fruit has not been tested.