treewide: add version to packages

Lots of packages are missing versions in their name. This adds them
where appropriate. These were found with this command:

 $ nix-env -qa -f. | grep -v '\-[0-9A-Za-z.-_+]*$' | grep -v '^hook$'

See issue #41007.

pkgs/development/libraries/re2/default.nix

@@ -1,11 +1,11 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  name = "re2";
+  name = "re2-${version}";
   version = "20140304";
 
   src = fetchurl {
-    url = "https://re2.googlecode.com/files/${name}-${version}.tgz";
+    url = "https://re2.googlecode.com/files/${name}.tgz";
     sha256 = "19wn0472c9dsxp35d0m98hlwhngx1f2xhxqgr8cb5x72gnjx3zqb";
   };