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/applications/misc/oneko/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, xorg, x11 }:
+{ stdenv, fetchurl, xorg, xlibsWrapper }:
 
 stdenv.mkDerivation rec {
   version = "1.2.sakura.5";
@@ -8,8 +8,8 @@ stdenv.mkDerivation rec {
     url = "http://www.daidouji.com/oneko/distfiles/oneko-${version}.tar.gz";
     sha256 = "2c2e05f1241e9b76f54475b5577cd4fb6670de058218d04a741a04ebd4a2b22f";
   };
-  buildInputs = [ xorg.imake xorg.gccmakedep x11 ];
-  
+  buildInputs = [ xorg.imake xorg.gccmakedep xlibsWrapper ];
+
   configurePhase = "xmkmf";
 
   installPhase = ''
@@ -31,4 +31,3 @@ stdenv.mkDerivation rec {
     platforms = platforms.unix;
   };
 }
-