libf2fs: fix build error on Windows am: 471bb35b42 am: 3249de482b am: fd3d4d9ad4 am: 70b97c6c6f

Original change: https://android-review.googlesource.com/c/platform/external/f2fs-tools/+/1333829

Change-Id: I1ccde004e40193719517d70a59834cad1b6a57ed