treewide: remove aliases in nixpkgs

This makes the command ‘nix-env -qa -f. --arg config '{skipAliases =
true;}'’ work in Nixpkgs.

Misc...

- qtikz: use libsForQt5.callPackage

  This ensures we get the right poppler.

- rewrites:

  docbook5_xsl -> docbook_xsl_ns
  docbook_xml_xslt -> docbook_xsl

diffpdf: fixup

pkgs/misc/drivers/moltengamepad/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, libudev }:
+{ stdenv, fetchFromGitHub, udev }:
 
 stdenv.mkDerivation rec {
   name = "moltengamepad-git-${version}";
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   hardeningDisable = [ "format" ];
 
-  buildInputs = [ libudev ];
+  buildInputs = [ udev ];
 
   buildPhase = ''
     make