New review comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/38986#discussion_r959541701

Comment:
Not sure but something like:
```
    if [ -z "${XBPS_CCACHE_NOCOMPRESS+set}" ]; then
        export CCACHE_COMPRESS=1
    fi
```

with `XBPS_CCACHE_NOCOMPRESS` from config file.

Disable ccache compression is NOT nice.