community/openjdk8: upgrade to 3.17.1 (8u275) and fix vfork issue
See https://mail.openjdk.java.net/pipermail/distro-pkg-dev/2020-November/042408.html
The new patch replaces calls to vfork() with regular fork(). As discussed in irclogs from 2020/12. This should fix the deadlocks while building on aarch64.