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

gcc-multilib: update to 10.2.1pre1
https://github.com/void-linux/void-packages/pull/28125

Description:
<!-- Mark items with [x] where applicable -->

#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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#### Does it build and run successfully? 
- [x] I built this PR locally for my native architecture, (x86_64-glibc)
- [x] I built and ran `virtualbox-ose-6.1.18` which needs this PR locally for `x86_64-glibc`