bug#10208: site-lisp directories in load-path after --no-site-lisp

[Juanma Barranquero]

Package: emacs

On non-w32 systems:

 - init_lread() removes directories matching "site-lisp" from
load-path, and then re-adds them unless --no-site-lisp was passed.
 - However, the site-lisp directories under the installation
(lread.c:4189) and source (lread.c:4229) directories are added
unconditionally.

On w32 systems, load-path gets its default from EMACSLOADPATH (defined
in w32.c:1592), which includes %emacs_dir%/site-lisp and
%emacs_dir%/../site-lisp unconditionally.

As an example, I build Emacs in

  C:\emacs\trunk

and have my site-lisp data in C:\emacs\site-lisp. After "emacs -Q",
load-path contains:

  c:/emacs/trunk/site-lisp
  C:/emacs/trunk/../site-lisp
  c:/emacs/site-lisp/bm
  c:/emacs/site-lisp/lua
  c:/emacs/site-lisp/slime
  c:/emacs/site-lisp/slime/contrib
  c:/emacs/site-lisp/slime/doc
  C:/emacs/trunk/lisp
  c:/emacs/trunk/lisp/calc
  [...]
  c:/emacs/trunk/lisp/cedet
  C:/emacs/trunk/leim

    Juanma