don't use PollParentThread for the wine process

[notaz]

In my setup (Ubuntu 22.04 + wine-9.10 (Staging)) the wine Vst process doesn't have a parent and gets killed by PollParentThread shortly after start. Strangely this only happens in 64bit mode and not in 32bit.

In either case it's a bad idea to rely on wine created process having a parent or not because the wine project may change this anytime.

[notaz]

@DomClark @lukas-w ping as git shows you as the authors of PollParentThread.

[lukas-w]

Sounds like this is the bug described by @PhysSong in the PR that introduced this, see #6366 (comment). There are a few suggestions to work around it in that comment and the following ones, all of which would be preferable to just removing the functionality in the 64bit Wine case as this PR does IMO.

This PR is still better than plain broken VSTs of course, so I won't object to merging it if there are no resources to implement a good solution. PR_SET_CHILD_SUBREAPER should be a 1-line-fix though so maybe give that a try?

[notaz]

PR_SET_CHILD_SUBREAPER also works for me so I submitted and alternative PR. Somebody should decide which one is better, as long as 64bit VSTs work it's good enough for me.

[DomClark]

I agree with @lukas-w that the PR_SET_CHILD_SUBREAPER approach is preferable. I'll close this PR in favour of that one.