Add support for splash progress mode from kernel cmdline

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/finit.h

@@ -98,6 +98,7 @@ extern int    cfglevel;
 extern int    prevlevel;
 extern int    rescue;
 extern int    single;
+extern int    splash;
 extern char  *rcsd;
 extern char  *sdown;
 extern char  *network;