Attach a bunch of meta.branch info for the monitor

This should stop explicitly-versioned expressions from showing up in the
monitor as in need of update.

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.1.2.nix

@@ -21,4 +21,7 @@ import ./generic.nix {
   postInstall = "
     sed 's|V4.2|V4.1.2|g' < ${docbook42catalog} > catalog.xml
   ";
+  meta = {
+    branch = "4.1.2";
+  };
 }

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.2.nix

@@ -7,4 +7,7 @@ import ./generic.nix {
     url = http://www.docbook.org/xml/4.2/docbook-xml-4.2.zip;
     md5 = "73fe50dfe74ca631c1602f558ed8961f";
   };
+  meta = {
+    branch = "4.2";
+  };
 }

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.3.nix

@@ -7,4 +7,7 @@ import ./generic.nix {
     url = http://www.docbook.org/xml/4.3/docbook-xml-4.3.zip;
     md5 = "ab200202b9e136a144db1e0864c45074";
   };
+  meta = {
+    branch = "4.3";
+  };
 }

pkgs/data/sgml+xml/schemas/xml-dtd/docbook/4.5.nix

@@ -7,4 +7,7 @@ import ./generic.nix {
     url = http://www.docbook.org/xml/4.5/docbook-xml-4.5.zip;
     sha256 = "1d671lcjckjri28xfbf6dq7y3xnkppa910w1jin8rjc35dx06kjf";
   };
+  meta = {
+    branch = "4.5";
+  };
 }

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

@@ -1,9 +1,9 @@
-{stdenv, fetchurl, unzip, src, name, postInstall ? "true"}:
+{ stdenv, fetchurl, unzip, src, name, postInstall ? "true", meta ? {} }:
 
 assert unzip != null;
 
 stdenv.mkDerivation {
-  inherit src name postInstall;
+  inherit src name postInstall meta;
   builder = ./builder.sh;
   buildInputs = [unzip];
 }