Update changelog for LibreSSL fixes
Update changelog for LibreSSL fixes

This changelog entry represents the previous three commits, which all
fix compile- or test-time problems running against LibreSSL.

Hasimir/cryptography,sholsapp/cryptography,Ayrx/cryptography,sholsapp/cryptography,kimvais/cryptography,bwhmather/cryptography,skeuomorf/cryptography,Hasimir/cryptography,Ayrx/cryptography,kimvais/cryptography,kimvais/cryptography,sholsapp/cryptography,skeuomorf/cryptography,bwhmather/cryptography,skeuomorf/cryptography,bwhmather/cryptography,Hasimir/cryptography,skeuomorf/cryptography,bwhmather/cryptography,kimvais/cryptography,sholsapp/cryptography,Ayrx/cryptography,Hasimir/cryptography,Ayrx/cryptography