e2fsprogs: disarm the mount-point check

Discovered while creating an ext2 file system on an sd_card (no
partitions, imx6), which failed with an error message that stated the
device is in use. Genode's libc/posix layer has no notion of mount
points.

Fixes #3271

repos/ports/ports/e2fsprogs.hash

@@ -1 +1 @@
-a65db85fad26a118b92cccf5ca742c1197809be3
+456c6445bab2a174dd845f7aa2beb767250722db

repos/ports/src/noux-pkg/e2fsprogs/patches/ismounted.c.patch

@@ -1,9 +1,10 @@
 +++ src/noux-pkg/e2fsprogs/lib/ext2fs/ismounted.c
-@@ -352,6 +352,9 @@
+@@ -352,6 +352,10 @@
  {
  	errcode_t	retval = 0;
  
 +	/* disarm the mount-point check as Genode has no notion of mount points */
++	*mount_flags = 0;
 +	return 0;
 +
  	if (is_swap_device(device)) {