language/node: npm pack ignore prepublish scripts

This tells npm pack to don't run prepublish scripts at all.
I think this is the best default because:
* most modules don't have a prepublish script at all and aren't affected
  by this change
* most prepublish scripts are calling devDeps, which would fail in our
  case, because (dev)Deps aren't installed at npm pack time until #2820
  gets resolved
* we favor npm registry tarball for formula downloads, which are already
  prepublished, so we would in the best case needlessly run prepublish
  a second time and in the worst case it would fail (because a clean
  step is required before running prepublish a second time in a row)
* This change does the right thing for >99% of all the packages and
  would only affect packages with prepublish scripts downloaded from a
  non-npm registry tarball (like github tarballs) and with a prepublish
  script wich does no't require any devDep (unlike for cross platform)

0 files changed, 0 insertions, 0 deletions