deps: float 3984ef0 from openssl / CVE-2018-0732 (6.x backport)

[rvagg]

Backport of #21282 but for OpenSSL 1.0.2
See also #21343 for 8.x

I'm not sure what 6.x lts label this should get, if any, so help would be appreciated.

Pending OpenSSL 1.0.2p release.
Ref: https://github.com/nodejs/node/pull/21282
Reviewed-By: Shigeki Ohtsu <ohtsu@ohtsu.org>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Upstream: https://github.com/openssl/openssl/commit/3984ef0
Original commit message:
Reject excessively large primes in DH key generation.
CVE-2018-0732
Signed-off-by: Guido Vranken <guidovranken@gmail.com>
(cherry picked from commit 91f7361)
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from #6457)

[nodejs-github-bot]

@rvagg build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/74/pipeline

[refack]

Re run initial lite CI: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/80/pipeline

[rvagg]

5a30e0b