Debian changes for final 0.95.4

These are the final changes for the new version 0.95.4. The main change
is set right the symbols for the new version, that include:

- Changes in debian/libwutil2.symbols from the git version to 0.95.4
- Changes in debian/changelog about the comments for the new version

On the other hand, the new debug schema is using hashes, therefore
the /usr/lib/debug/wmaker folder not longer exists. The new folder
is /usr/lib/debug/.build-id. This folder is auto-created and then
we don't need create it in debian/wmaker-dbg.dirs. Therefore, the file
debian/wmaker-dbg.dirs is empty and can be removed.

Finally, a little comment about folder in debian/README.Debian.

debian/README.Debian

@@ -183,7 +183,7 @@ theme.
 
 If you don't like the arrangement of the Appearance menu, you can put
 a file "appearance.menu" in ~/GNUstep/Library/WindowMaker, and it will
-override the default one. Look at /etc/X11/WindowMaker/appearance.menu
+override the default one. Look at /etc/GNUstep/Defaults/appearance.menu
 for an example.
 
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