devel/idutils: Resolve conflict with coreutils

pkg-static: idutils-4.6_2 conflicts with coreutils-8.28 (installs files into the same place). Problematic file: /usr/local/bin/gid

For lack of a better solution resolve this by prefixing gid with a g.
It is now installed as ggid.

linux-gid and sh-utils no longer seem to exist in the tree, so drop
CONFLICTS completely.

PR: 224985
Submitted by: Trond.Endrestol@ximalas.info
Approved by: peterj (maintainer timeout, 3 years)