external/boringssl: Sync to a0b49d63fdc33e54eac93674c86891d15d181d87.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/2fb729d4f36beaf263ad85e24a790b571652679c..a0b49d63fdc33e54eac93674c86891d15d181d87

Test: atest CtsLibcoreTestCases
Change-Id: Ida4794d56d237422351b9ddcc7d0bc9295e816e1
347 files changed