Consider a mode that does not strip build-id

[wraithgar]

Build id is a pretty grey area for semver and the npm registry. Since it's not part of semver resolution it's stripped when sending the packument data, but kept in the package.json in the tarball.

Discussion at https://github.com/npm/cli/issues/1479

npm pkg fix may want to not strip build id by default.

[wraithgar]

To be clear, the packument sent to the registry still needs the build id stripped.