New comment by paper42 on void-packages repository

https://github.com/void-linux/void-packages/pull/32231#issuecomment-888600324

Comment:
> > > pre_configure is not necessary, because you use a tarball with pregenerated configure script. The commit message body is not necessary.
> > 
> > yes and you might be able to remove the hostmakedepends variable then
> 
> without the pre_configure block it builds fine
> but it depends on the hostmakedepends variable

sorry, I forgot about flex, we can drop automake and libtool, but have to leave flex there

```
hostmakedepends="flex"
```

Can you also fix the lint issue from CI?

> srcpkgs/libcgroup/template:10: use SPDX id for 'LGPL-2.1' license or see Manual.md