Update homepage attributes: http -> https

Homepage link "http://.../" is a permanent redirect to "https://.../" and should be updated
https://repology.org/repository/nix_stable/problems

pkgs/development/libraries/ffms/default.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ zlib ffmpeg ];
 
   meta = with stdenv.lib; {
-    homepage = http://github.com/FFMS/ffms2/;
+    homepage = https://github.com/FFMS/ffms2/;
     description = "Libav/ffmpeg based source library for easy frame accurate access";
     license = licenses.mit;
     maintainers = with maintainers; [ fuuzetsu ];