using relative paths (for images) needs default-directory gaoled

[mmc maruska dyndns org (Michal Maruška)]

For example if you want to run sawfish in place (without running make install),

SAWFISHDOCFILE=./DOC SAWFISHDIR=./ SAWFISHLISPDIR=./lisp  SAWFISHEXECDIR=./src/.libexec  src/sawfish

might fail w/ errors like: 
bad argument: make-image  () 1

which is very misleading, given that the wrong argument is given to the
file-name-as-directory alias  Ffile_name_as_directory, which is called w/ the
value of default-directory.

the images are used inside (gaoled) themes, so 
  lisp/sawfish/wm/gaol.jl  needs:

  
  (define safe-specials
-    '(default-foreground display-name canonical-display-name 
+    '(default-foreground display-name canonical-display-name default-directory