treewide: Move some meta sections to end-of-file

That seems to be the overwhelming convention.

pkgs/development/libraries/libctemplate/2.2.nix

@@ -1,6 +1,15 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
+  pname = "ctemplate";
+  version = "2.2";
+  name = "${pname}-${version}";
+
+  src = fetchurl {
+    url = "http://ctemplate.googlecode.com/files/${name}.tar.gz";
+    sha256 = "0vv8gvyndppm9m5s1i5k0jvwcz41l1vfgg04r7nssdpzyz0cpwq4";
+  };
+
   meta = {
     description = "A simple but powerful template language for C++";
     longDescription = ''
@@ -10,13 +19,4 @@ stdenv.mkDerivation rec {
     homepage = http://code.google.com/p/google-ctemplate/;
     license = "bsd";
   };
-
-  pname = "ctemplate";
-  version = "2.2";
-  name = "${pname}-${version}";
-
-  src = fetchurl {
-    url = "http://ctemplate.googlecode.com/files/${name}.tar.gz";
-    sha256 = "0vv8gvyndppm9m5s1i5k0jvwcz41l1vfgg04r7nssdpzyz0cpwq4";
-  };
 }