external/boringssl: Sync to 3120950b1e27635ee9b9d167052ce11ce9c96fd4.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/5e578c9dba73460c3eb17f771c77fc8e36f7812e..3120950b1e27635ee9b9d167052ce11ce9c96fd4

Test: BoringSSL CTS Presubmits.
Change-Id: I54d7540777ffdf1e72c4ff67f3138097cbdbeafb
52 files changed