r8305 made platform_x11_best_transport[] obsolete, but there still seem to be a

few instances around; expunge them.

[originally from svn r8382]
[r8305 == ca6fc3a4da]

unix/uxcons.c

@@ -416,8 +416,6 @@ int is_interactive(void)
  * X11-forwarding-related things suitable for console.
  */
 
-const char platform_x11_best_transport[] = "unix";
-
 char *platform_get_x_display(void) {
     return dupstr(getenv("DISPLAY"));
 }