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/development/libraries/glew/1.10.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, libGLU, x11, libXmu, libXi
+{ stdenv, fetchurl, libGLU, xlibsWrapper, libXmu, libXi
 , buildPlatform, hostPlatform
 , AGL ? null
 }:
@@ -13,7 +13,8 @@ stdenv.mkDerivation rec {
     sha256 = "01zki46dr5khzlyywr3cg615bcal32dazfazkf360s1znqh17i4r";
   };
 
-  buildInputs = [ x11 libXmu libXi ] ++ optionals stdenv.isDarwin [ AGL ];
+  buildInputs = [ xlibsWrapper libXmu libXi ]
+              ++ optionals stdenv.isDarwin [ AGL ];
   propagatedBuildInputs = [ libGLU ]; # GL/glew.h includes GL/glu.h
 
   patchPhase = ''