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

common/build-style/go.sh: use -modcacherw
https://github.com/void-linux/void-packages/pull/43288

Description:
makes sure the go mod cache is not read only and ./xbps-src zap can properly remove it

<!-- Uncomment relevant sections and delete options which are not applicable -->

#### Testing the changes
- I tested the changes in this PR: **YES**

If someone wants to test this, try to build go-ipfs which fails and then zap the masterdir. Without this change, you will get a lot of error messages about not removing a read only file.

cc @the-maldridge