Reproducible Builds: Sort protoList before marshal

[kpcyrd]

hi!

This patch sorts the results before they're marshaled and written to disk. This seems to be sufficient to make dlc.dat reproducible, meaning building from the same git commit generates a file with an identical sha256sum.

This change makes the v2ray-domain-list-community Arch Linux package reproducible on our reproducible builds system.

Before

% go run main.go
Use domain lists in ./data
dlc.dat has been generated successfully.
% sha256sum dlc.dat
e29639d1ac64774086a9fa7ab60f1b1acdbcf558d9724b9e430495fdb68e4624  dlc.dat
% go run main.go   
Use domain lists in ./data
dlc.dat has been generated successfully.
% sha256sum dlc.dat
18d2560fc752e9ef82545188a15fa5ea36815f2a0082582483169f68adcff704  dlc.dat
% 

After

% go run main.go   
Use domain lists in ./data
dlc.dat has been generated successfully.
% sha256sum dlc.dat
dcea8ef9b4ba59c8355b194b072a81b9ca55db7df608b7849f7b6c7db4730ff6  dlc.dat
% go run main.go   
Use domain lists in ./data
dlc.dat has been generated successfully.
% sha256sum dlc.dat
dcea8ef9b4ba59c8355b194b072a81b9ca55db7df608b7849f7b6c7db4730ff6  dlc.dat
% 

[Loyalsoldier]

Thanks for your contribution 🎉