opensmtpd: migrate to by-name

-2
pkgs/servers/mail/opensmtpd/default.nix pkgs/by-name/op/opensmtpd/package.nix
pkgs/servers/mail/opensmtpd/proc_path.diff pkgs/by-name/op/opensmtpd/proc_path.diff
-2
pkgs/top-level/all-packages.nix
··· 12100 12100 modules = [ ]; 12101 12101 }; 12102 12102 12103 - opensmtpd = callPackage ../servers/mail/opensmtpd { }; 12104 - 12105 12103 system-sendmail = lowPrio (callPackage ../servers/mail/system-sendmail { }); 12106 12104 12107 12105 # PulseAudio daemons