kubo: remove openssl from the build

We removed openssl support from go-libp2p and thus Kubo:
- libp2p/go-libp2p#1952

Now we exclusively on the options provided by the golang std librairy.
The openssl tag is now a noop, having it does not cause any harm except
making nixos install openssl for no reason while using kubo but I guess
many systems already build openssl but might as well not have it.

pkgs/applications/networking/kubo/default.nix

@@ -25,10 +25,6 @@ buildGoModule rec {
 
   subPackages = [ "cmd/ipfs" ];
 
-  buildInputs = [ openssl ];
-  nativeBuildInputs = [ pkg-config ];
-  tags = [ "openssl" ];
-
   passthru.tests.kubo = nixosTests.kubo;
 
   vendorSha256 = null;