tigervnc: update to 1.13.1, add service directory

[zmudc]

In addition to updating to the latest version, this commit also fixes multiple issues with this package:

• Upstream only provides a systemd service, but Void needs a runit service
• Upstream presumes a system with SELinux and systemd, but Void does not have SELinux and uses elogind, not systemd
• Upstream requires an Xsession script that is not always present on Void systems
• Upstream only provides a forking and detaching vncsession daemon which is not very compatible with runit

This PR addresses all of the above issues by adding the necessary tweaks for Void:

• Void-compatible PAM configuration for systems without SELinux and elogind instead of systemd
• a fallback Xsession wrapper script
• define conf_files that should not be overwritten on upgrades
• add a README.voidlinux file
• patch vncsession.c to provide an option to prevent it from forking
• patch vncsession-start.in to use the option to prevent vncsession from forking

The patch to vncsession.c hopefully will be accepted upstream to fix upstream issue: TigerVNC/tigervnc#1649. The patch has been submitted to upstream as TigerVNC/tigervnc#1651

Closes #45522

Testing the changes

• I tested the changes in this PR: YES Tested on x86_64-musl, also built for x86_64, checked xlint which passed

[zmudc]

I forget to mention cross compiling for armv7l also tested successfully.

[zmudc]

The updated PR has been tested and is ready to be reviewed for the second round. I think it addresses all of the concerns of @classabbyamp. Sorry about the noise but I think the PR is OK now - it has one commit and it has fixed a typo in README.voidlinux

Thanks.

Also, note that the e-mail address to which github sent messages for this PR does not match the e-mail address I put in the commit message. I haven't figured out how to fix that yet. I wanted github to use the [email protected] address, and I set my public address to that address and used that address in the commit message, but github for some reason sent the comments to my other email address associated with my github account: [email protected]. I think it is because there were more email settings I had to update. Hopefully it is fixed now. Sorry about that.

[zmudc]

This last push just corrected a typo in README.voidlinux - there was a repeated word. Prior to this, all eight tests passed.

[ahesford]

We won't accept the non-daemonize patch until it's accepted upstream.

[zmudc]

We won't accept the non-daemonize patch until it's accepted upstream.

OK. I doubt upstream will take it. So I will close this now and re-submit a PR if upstream takes the non-daemonize patch. Thanks.