gen-doc: Updates for latest cpu definitions

gen-doc: Updates for latest cpu definitions

Doc generation was no longer working due to several issues.

 - openrisc.cpu no longer exists (its not cpu/or1k.cpu in binutils-gdb)
 - Relavive paths for archfile no longer work due to wrong cwd.
 - Many architectures have been added and removed.

I have be able to get this working and added all the architectures I
could get working with the below changes. I have posted the results
here:

  http://shorne.noip.me/downloads/gen-doc/

ChangeLog:

yyyy-mm-dd  Stafford Horne  <shorne@gmail.com>

	* gen-all-doc (archs): Add new archs and update locations.
	(archfile): Prepend cgendir.
	(index.html gen): Change name openrisc to or1k.
	* html.scm (gen-html-trailer): Change redhat.com to
	sourceware.org.