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/os-specific/linux/amdgpu-pro/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchurl, elfutils
-, xorg, patchelf, openssl, libdrm, libudev
+, xorg, patchelf, openssl, libdrm, udev
 , libxcb, libxshmfence, epoxy, perl, zlib
 , fetchFromGitHub, ncurses
 , libsOnly ? false, kernel ? null
@@ -101,7 +101,7 @@ in stdenv.mkDerivation rec {
 
   depLibPath = makeLibraryPath [
     stdenv.cc.cc.lib xorg.libXext xorg.libX11 xorg.libXdamage xorg.libXfixes zlib
-    xorg.libXxf86vm libxcb libxshmfence epoxy openssl libdrm elfutils libudev ncurses5
+    xorg.libXxf86vm libxcb libxshmfence epoxy openssl libdrm elfutils udev ncurses5
   ];
 
   installPhase = ''