Update to Wine 4.15. This includes the following changes:

• Initial implementation of the HTTP service.
• RichEdit control optimizations.
• Various bug fixes.

lib/wine/wuauserv.exe.so (and Co) have moved from the Staging patchset,
off by default, to upstream.

A variation of files/patch-dlls_iphlpapi_ipstats.c has been merged
upstream after my submission, so drop this local patch.