treewide: update homepages to https where available

Based on "problems" from repology:

https://repology.org/repository/nix_unstable/problems

Mostly simple changes to reflect redirects.

pkgs/development/libraries/liblognorm/default.nix

@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   configureFlags = [ "--enable-regexp" ];
 
   meta = with stdenv.lib; {
-    homepage = http://www.liblognorm.com/;
+    homepage = https://www.liblognorm.com/;
     description = "Help to make sense out of syslog data, or, actually, any event data that is present in text form";
     license = licenses.lgpl21;
     platforms = platforms.all;