bug#56614: two problems with `package--reload-previously-loaded'

[Lars Ingebrigtsen]

Paul Pogonyshev <pogonyshev@gmail.com> writes:

> Please find attached. I added comments for both changes that explain the 
> reasoning,
> so that they are not accidentally reverted by a later change.
>
> Also replaced obsolete `find-function-source-path' with its new name
> `find-library-source-path'.

Thanks; pushed to Emacs 29 (with some whitespace changes).