external/boringssl: add build target for CAVP helper.

CAVP is a program run by NIST for black-box testing of cryptographic
implementations. The cavp binary in BoringSSL can run a subset of the
NIST tests when used in conjuction with a set of NIST test vectors and
the run_cavp.go wrapper in BoringSSL.

This change adds a build-system target for the cavp helper.

Test: none; this is a test helper binary itself.

Change-Id: Id85c67136eee864dc48ea48ffd5ffc04a6d5568a
1 file changed