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

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

Change-Id: If11d0367234c94dcfcf21c6dbd152458c20fc66f