treewide maintainers: remove myself from a few places

It will better reflect the reality of the past few years.

pkgs/development/libraries/fontconfig/default.nix

@@ -118,6 +118,6 @@ stdenv.mkDerivation rec {
     homepage = "http://fontconfig.org/";
     license = licenses.bsd2; # custom but very bsd-like
     platforms = platforms.all;
-    maintainers = [ maintainers.vcunat ];
+    maintainers = [ ];
   };
 }