New comment by pullmoll on void-packages repository

https://github.com/void-linux/void-packages/issues/26811#issuecomment-736014232

Comment:
So after running `./xbps-src -a arvm7l-musl -C -N pkg mesa` five or six times I finally got it so far that the expected file was there. This seems to be a bug in the handling of parallelism when cross compiling, or more probably a missing dependency in some place.