libcrypto can now be split in two, with everything that depends on
crypto/asn1 in a separate library. That said, Chromium still needs
crypto/pkcs8 to be implemented with CBS/CBB first. (Also libssl and
anything which uses X509* directly.)

BUG=54

Change-Id: Iec976ae637209882408457e94a1eb2465bce8d56
Reviewed-on: https://boringssl-review.googlesource.com/13059
Reviewed-by: Adam Langley <alangley@gmail.com>
Commit-Queue: Adam Langley <alangley@gmail.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>