[Backport release-25.05] lldpd: fix cross compilation (#449354)

pkgs/by-name/ll/lldpd/package.nix

···
     openssl
   ];
 
+  preConfigure = lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
+    # Yes, this works and is required for cross :'/
+    export PATH=$PATH:${net-snmp.dev}/bin
+  '';
+
   enableParallelBuilding = true;
 
   outputs = [

pkgs/by-name/ne/net-snmp/package.nix

···
 
   meta = with lib; {
     description = "Clients and server for the SNMP network monitoring protocol";
-    homepage = "http://www.net-snmp.org/";
+    homepage = "https://www.net-snmp.org/";
     license = licenses.bsd3;
     platforms = platforms.unix;
   };