gnucash: add ${gconf}/bin to $PATH in wrapper scripts

GnuCash attempt to call gconf binaries to register its schemas in the
system-wide database. That still doesn't work, of course, because gconf
can't update its store path. TODO. :-(

svn path=/nixpkgs/trunk/; revision=27688

pkgs/applications/office/gnucash/default.nix

@@ -44,7 +44,8 @@ stdenv.mkDerivation {
     do
       wrapProgram "$prog"                                       \
         --set SCHEME_LIBRARY_PATH "$SCHEME_LIBRARY_PATH"        \
-        --prefix GUILE_LOAD_PATH ":" "$GUILE_LOAD_PATH"
+        --prefix GUILE_LOAD_PATH ":" "$GUILE_LOAD_PATH"         \
+        --prefix PATH ":" "${gconf}/bin"
     done
   '';