This drops v8_hello_world, v8_parser_shell and v8_sample_process from the
official v8 archives.

This also adds a new option to differentiate library and executable
archives.

NOTRY=true
TBR=marja@chromium.org

Bug: v8:5918
Change-Id: I946708f2eeb030296c5ce284541ecf719522186c
Reviewed-on: https://chromium-review.googlesource.com/554753Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46312}