Treewide: use HTTPS on GNU domains

HTTP -> HTTPS for :
- http://gnu.org/
- http://www.gnu.org/
- http://elpa.gnu.org/
- http://lists.gnu.org/
- http://gcc.gnu.org/
- http://ftp.gnu.org/ (except in fetchurl mirrors)
- http://bugs.gnu.org/

pkgs/games/xboard/default.nix

@@ -9,12 +9,12 @@ let
     version="4.9.1";
     name="${baseName}-${version}";
     hash="1mkh36xnnacnz9r00b5f9ld9309k32jv6mcavklbdnca8bl56bib";
-    url="http://ftp.gnu.org/gnu/xboard/xboard-4.9.1.tar.gz";
+    url="https://ftp.gnu.org/gnu/xboard/xboard-4.9.1.tar.gz";
     sha256="1mkh36xnnacnz9r00b5f9ld9309k32jv6mcavklbdnca8bl56bib";
   };
   buildInputs = [
-    libX11 xproto libXt libXaw libSM libICE libXmu 
-    libXext gnuchess texinfo libXpm pkgconfig librsvg 
+    libX11 xproto libXt libXaw libSM libICE libXmu
+    libXext gnuchess texinfo libXpm pkgconfig librsvg
     cairo pango gtk2
   ];
 in
@@ -27,6 +27,7 @@ stdenv.mkDerivation {
   meta = {
     inherit (s) version;
     description = ''GUI for chess engines'';
+    homepage = https://www.gnu.org/software/xboard/;
     maintainers = [stdenv.lib.maintainers.raskin];
     platforms = stdenv.lib.platforms.unix;
     license = stdenv.lib.licenses.gpl3Plus;

pkgs/games/xboard/default.upstream

@@ -1 +1 @@
-url http://ftp.gnu.org/gnu/xboard/
+url https://ftp.gnu.org/gnu/xboard/