[asio] Ignore SSLv2 when using BoringSSL

BoringSSL doesn't allow the use of (the deeply-flawed) SSL version 2. It
also doesn't allow consumers to reach directly inside the SSL struct,
which is what asio was using to detect SSLv2 for OpenSSL pre-1.0.1.
This CL simply extends the preprocessor conditional to include
BoringSSL.

Change-Id: Ie423f2b9f1394fca83da9b0b23f176bac59a4c03
1 file changed
tree: 2132ed857c784ccdbf0df81c601a8686ab378e38
  1. .gitignore
  2. BUILD.gn
  3. asio/