Revert "Metadata update for all dev packages"
Revert "Metadata update for all dev packages"

This reverts commit 069a895d8f6d8d212e75798a275003df3e93506f.
Turns out this didn't really work, and there is no good way to make it work in
a satisfactory way with the current architecture.
Ref: #1316

abate/opam,abate/opam