Remove conditional includes from bootstrap

Remove conditional includes from bootstrap

 * lisp/loadup.el: No longer load optional includes during bootstrap
   dumping.
 * lisp/ldefs-boot-auto.el: Regenerated.

Previously, bootstrap-emacs includes optional functionality, depending
on the platform which is not needed for bootstrap function. As a result,
bootstrap-emacs contains different functions in different
circumstances. If ldefs-boot-auto.el is generated, then loaded functions
will not be added to ldefs-boot-auto.el, although they may be required
during some builds. With this change, bootstrap-emacs should always
behave the same way and, therefore, require the same autoloads.