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

That seems to be the overwhelming convention.

pkgs/development/libraries/libmhash/default.nix

@@ -1,6 +1,19 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
+  pname = "mhash";
+  version = "0.9.9.9";
+  name = "${pname}-${version}";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/${pname}/${name}.tar.bz2";
+    sha256 = "1w7yiljan8gf1ibiypi6hm3r363imm3sxl1j8hapjdq3m591qljn";
+  };
+
+  dontDisableStatic = true;
+
+  patches = [ ./autotools-define-conflict-debian-fix.patch ];
+
   meta = {
     description = "Hash algorithms library";
     longDescription = ''
@@ -12,17 +25,4 @@ stdenv.mkDerivation rec {
     homepage = http://mhash.sourceforge.net;
     license = "LGPL";
   };
-
-  pname = "mhash";
-  version = "0.9.9.9";
-  name = "${pname}-${version}";
-
-  dontDisableStatic = true;
-
-  src = fetchurl {
-    url = "mirror://sourceforge/${pname}/${name}.tar.bz2";
-    sha256 = "1w7yiljan8gf1ibiypi6hm3r363imm3sxl1j8hapjdq3m591qljn";
-  };
-
-  patches = [ ./autotools-define-conflict-debian-fix.patch ];
 }