xorg-server: clear the bogus font paths
libpng: bugfix update 1.6.1 -> 1.6.2
Merge commit 'refs/top-bases/tmp/x-updates-fixes' into tmp/x-updates-fixes

* commit 'refs/top-bases/tmp/x-updates-fixes':
  libpng: bugfix update 1.6.1 -> 1.6.2
  xorg-server: clear the bogus font paths

Conflicts:
	pkgs/servers/x11/xorg/overrides.nix
glib fix