ssl: Backport fix for signature_algorithms_cert
ssl: Backport fix for signature_algorithms_cert

This commit fixes interoperability problems with openssl when
the TLS 1.3 server is using the option signature_algs_cert.

In such cases the signature_algorithms_cert extension was encoded
as a signature_algorithms extension and openssl s_client returned
an Illegal Parameter Alert due to its filtering of extension
duplicates.

vinoski/otp,uabboli/otp,electricimp/otp,bjorng/otp,kvakvs/otp,lrascao/otp,emacsmirror/erlang,dumbbell/otp,aboroska/otp,dumbbell/otp,getong/otp,lrascao/otp,electricimp/otp,uabboli/otp,uabboli/otp,mikpe/otp,g-andrade/otp,kvakvs/otp,potatosalad/otp,vladdu/otp,isvilen/otp,aboroska/otp,getong/otp,bjorng/otp,getong/otp,lrascao/otp,lrascao/otp,RoadRunnr/otp,vladdu/otp,getong/otp,kvakvs/otp,dgud/otp,erlang/otp,RoadRunnr/otp,g-andrade/otp,rlipscombe/otp,vinoski/otp,uabboli/otp,erlang/otp,getong/otp,dumbbell/otp,kvakvs/otp,jj1bdx/otp,electricimp/otp,vladdu/otp,kvakvs/otp,g-andrade/otp,g-andrade/otp,g-andrade/otp,emacsmirror/erlang,potatosalad/otp,electricimp/otp,electricimp/otp,dumbbell/otp,vladdu/otp,g-andrade/otp,rlipscombe/otp,dgud/otp,isvilen/otp,rlipscombe/otp,erlang/otp,RoadRunnr/otp,vladdu/otp,potatosalad/otp,vinoski/otp,emacsmirror/erlang,ferd/otp,jj1bdx/otp,dgud/otp,jj1bdx/otp,ferd/otp,bjorng/otp,aboroska/otp,getong/otp,isvilen/otp,dgud/otp,bjorng/otp,mikpe/otp,ferd/otp,lrascao/otp,jj1bdx/otp,erlang/otp,dgud/otp,vladdu/otp,potatosalad/otp,jj1bdx/otp,getong/otp,vinoski/otp,RoadRunnr/otp,jj1bdx/otp,potatosalad/otp,mikpe/otp,vinoski/otp,g-andrade/otp,dgud/otp,rlipscombe/otp,emacsmirror/erlang,vinoski/otp,aboroska/otp,lrascao/otp,kvakvs/otp,dgud/otp,uabboli/otp,emacsmirror/erlang,mikpe/otp,bjorng/otp,dumbbell/otp,g-andrade/otp,potatosalad/otp,erlang/otp,rlipscombe/otp,rlipscombe/otp,dgud/otp,lrascao/otp,RoadRunnr/otp,erlang/otp,electricimp/otp,jj1bdx/otp,aboroska/otp,isvilen/otp,jj1bdx/otp,emacsmirror/erlang,bjorng/otp,vinoski/otp,mikpe/otp,mikpe/otp,electricimp/otp,bjorng/otp,erlang/otp,ferd/otp,dumbbell/otp,bjorng/otp,aboroska/otp,RoadRunnr/otp,aboroska/otp,mikpe/otp,isvilen/otp,ferd/otp,potatosalad/otp,getong/otp,bjorng/otp,erlang/otp,uabboli/otp,isvilen/otp,uabboli/otp,vinoski/otp,kvakvs/otp,mikpe/otp,uabboli/otp,dgud/otp,erlang/otp,rlipscombe/otp,RoadRunnr/otp,lrascao/otp,dumbbell/otp,ferd/otp,electricimp/otp,g-andrade/otp,rlipscombe/otp,bjorng/otp,rlipscombe/otp,ferd/otp,isvilen/otp,uabboli/otp,potatosalad/otp,potatosalad/otp,lrascao/otp,getong/otp,mikpe/otp,electricimp/otp,RoadRunnr/otp,emacsmirror/erlang,potatosalad/otp,isvilen/otp,dgud/otp,isvilen/otp,kvakvs/otp,vladdu/otp,dumbbell/otp,rlipscombe/otp,emacsmirror/erlang,getong/otp,jj1bdx/otp,emacsmirror/erlang,aboroska/otp,emacsmirror/erlang,aboroska/otp,dumbbell/otp,kvakvs/otp,jj1bdx/otp,isvilen/otp,vinoski/otp,ferd/otp,dumbbell/otp,vinoski/otp,vladdu/otp,vladdu/otp,g-andrade/otp,mikpe/otp,RoadRunnr/otp,erlang/otp,ferd/otp