syscalls needed for doom (tell/eof/draw_fb) + minor fixes, compiler shut up etc

src/kapps/kshell.c

@@ -82,6 +82,7 @@ void kill()
  */
 void pedicel_main(void* arg)
 {
+    (void)arg;
     printf("Welcome to the kernel shell!\r\nType 'help' for a list of commands.\r\n");
 
     for (;;) {