Reapply revision 542851 that broke the index via an interaction with
emulators/i386-wine-devel and was reverted, now with a tweak to avoid
that breakage:

The Wine Staging patchset for Wine 5.13 is now available and fixed
(compared to the previous one).

It also addresses the build issue for Wine 5.13 that I fixed via
files/patch-dlls-ntdll-unix-registry.c, so we need to make that
patch only apply when the Wine Staging patchset is not used.

PR: 248118 [1]
Submitted by: vvd@unislabs.com