Move OS-specific driver configuration to grub_util_fd_open. This

moves OS-dependent parts from kern/emu/hostdisk.c to
	grub-core/osdep/*/hostdisk.c.

grub-core/osdep/aros/hostdisk.c

@@ -169,6 +169,13 @@ grub_util_fd_open (const char *dev, int flg)
   IPTR unit = 0;
   ULONG flags = 0;
 
+#ifdef O_LARGEFILE
+  flg |= O_LARGEFILE;
+#endif
+#ifdef O_BINARY
+  flg |= O_BINARY;
+#endif
+
   ret->off = 0;
 
   if (dev[0] == '\0')
@@ -479,12 +486,6 @@ grub_util_fd_sync (grub_util_fd_t fd)
     }
 }
 
-
-void
-grub_hostdisk_configure_device_driver (grub_util_fd_t fd __attribute__ ((unused)))
-{
-}
-
 void
 grub_hostdisk_flush_initial_buffer (const char *os_dev __attribute__ ((unused)))
 {