libf2fs: fix build error on Windows am: a0823d077c am: 15936d35f5 am: 95042ab4ba

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/f2fs-tools/+/11884882

Change-Id: I9e10a95f7031fbf88e7f9b2b3a8b3f0f71c4554e