[Bug 41703] LdrUnloadDll is not suit for musl( musl lacks unload support though it has a dlclose())

https://bugs.winehq.org/show_bug.cgi?id=41703

--- Comment #11 from Austin English  ---
(In reply to xw897002528 from comment #10)
> Created attachment 56144 [details]
> the second edition

The fixme shouldn't say musl, since other compilers may have the same issue.
Just say "This isn't supported on this platform", or something along those
lines. Grep the source for similar wording.