Add missing "openssl" build input to "mysql" in post-processing.
Add missing "openssl" build input to "mysql" in post-processing.

spencerjanssen/cabal2nix,Fuuzetsu/cabal2nix,jb55/cabal2nix,psibi/cabal2nix,gridaphobe/cabal2nix,bennofs/cabal2nix,dmalikov/cabal2nix