New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/30110#issuecomment-816858217

Comment:
Clean the musl specific part from `pre_check`, it's no longer valid.

The `bmake` error failure seems to be due to an extra `bmake` error message?

```
~/v/void-packages master [~5] 😨 31s ➜ cat masterdir/builddir/mk-configure-mk-configure-0.36.0/tests/test_subprj_dash/expect.out
Dash symbol is not allowed inside subdir (another-one prog100-500)
~/v/void-packages master [~5] 😨 ➜ cat masterdir/builddir/mk-configure-mk-configure-0.36.0/tests/test_subprj_dash/test_subprj_dash.test.out

Dash symbol is not allowed inside subdir (another-one prog100-500)
bmake: stopped in /objdir
```