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

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

Change-Id: Ib1371a3ef3ae8d57f0f3cfc322f56c5e4a428afa