There's a closed pull request on the void-packages repository

tigervnc: update to 1.13.1, add service directory
https://github.com/void-linux/void-packages/pull/45307

Description:
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: https://github.com/TigerVNC/tigervnc/issues/1649. The patch has been submitted to upstream as https://github.com/TigerVNC/tigervnc/pull/1651

Closes https://github.com/void-linux/void-packages/issues/45522

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#### 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