docbook_xsl_*: Remove builder.sh

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/builder.sh

@@ -1,7 +0,0 @@
-source $stdenv/setup
-
-mkdir -p $out/xml/dtd/docbook
-cd $out/xml/dtd/docbook
-unpackFile $src
-find . -type f -exec chmod -x {} \;
-eval "$postInstall"

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/generic.nix

@@ -1,13 +1,22 @@
 { stdenv, fetchurl, unzip, src, name, postInstall ? "true", meta ? {}, findXMLCatalogs }:
 
-assert unzip != null;
-
 stdenv.mkDerivation {
   inherit src name postInstall;
-  builder = ./builder.sh;
+
   nativeBuildInputs = [unzip];
   propagatedNativeBuildInputs = [ findXMLCatalogs ];
 
+  unpackPhase = ''
+    mkdir -p $out/xml/dtd/docbook
+    cd $out/xml/dtd/docbook
+    unpackFile $src
+  '';
+
+  installPhase = ''
+    find . -type f -exec chmod -x {} \;
+    runHook postInstall
+  '';
+
   meta = meta // {
     platforms = stdenv.lib.platforms.unix;
   };