tree-wide: replace uses of splitString "." with lib.versions

Quoting from the splitString docstring:

   NOTE: this function is not performant and should never be used.

This replaces trivial uses of splitString for splitting version
strings with the (potentially builtin) splitVersion.

pkgs/development/libraries/sqlite/archive-version.nix

@@ -1,9 +1,9 @@
 lib: version:
 
 with lib;
-  
+
 let
-  fragments = splitString "." version;
+  fragments = splitVersion version;
   major = head fragments;
   minor = concatMapStrings (fixedWidthNumber 2) (tail fragments);
 in