New comment by Johnnynator on void-packages repository

https://github.com/void-linux/void-packages/pull/24258#issuecomment-675717080

Comment:
@pullmoll The problem with `openjdk9` (and other bootstrap ones maybe), is that it doesn't correctly detect gcc with multi digit versions. https://hg.openjdk.java.net/jdk8u/jdk8u-dev/raw-rev/39a7914e14a0