#10 defsystem clisp paths/missing defsystem form slots

[Stephen Compall]

This patches 2 definitions in
src/defsystem-3.x/defsystem.lisp.

The first part changes append-logical-pnames to account
for, for example, (merge-pathnames (pathname "base")
(pathname "clocc:src;ytools;")) => #P"base" on clisp.

The second part fixes preprocess-component-definition's
silent removal of defsystem options in
*component-form-slots* on all Lisps.

[Stephen Compall]

the aggregate patch

[Stephen Compall]

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I believe the former problem can also be fixed by setting
custom:*parse-namestring-ansi* to t.