external/boringssl: Sync to c9827e073f64e353c4891ecc2c73721882543ee0.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/387b07b78dac785a341eeb2ff86e29393ffe8627..c9827e073f64e353c4891ecc2c73721882543ee0

Test: atest CtsLibcoreTestCases (TODO)
Change-Id: Ie7c2899ac4ea374113e0fe3b76f9a4dce36ea8de
31 files changed