f2fs-tools: fall back to the original version check when clock_gettime is not supported am: 3b96ccbb7d am: 5bd01dc591

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/f2fs-tools/+/15937663

Change-Id: Ifb135f6bd4c5eba16cf0a252f492ac9dcc36dc7b