libf2fs: fix build error on Windows am: a0823d077c am: b56b82b81e am: 72e09cefd3 am: 13b169b594

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

Change-Id: I6c3b5a7fe97ff7bf87c9caaba88ee821cca9f01d