external/boringssl: Sync to 2c45fa0b90f61b27973fa81893e014fc8c8e8999.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/faa539f877432814d0f2de19846eb99f2ea1e207..2c45fa0b90f61b27973fa81893e014fc8c8e8999

Test: BoringSSL CTS Presubmits
Change-Id: Ie6dc40e0c979168ec73fa1165cbc6e6b83793439
300 files changed