f2fs-tools: fall back to the original version check when clock_gettime is not supported am: 3b96ccbb7d am: 0e5e20e30a am: 3cc881cb0f

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

Change-Id: I521db211ba160639f19d869ee0c17375c6a6e6bb