FROMLIST: selftests: futex: Use a 64-bit time_t am: 2cfedebbe1 am: 8ccb3438f6

Original change: https://android-review.googlesource.com/c/platform/external/linux-kselftest/+/2791624

Change-Id: I67a864c4d30d0d867e8567acc99d5a82f8a84ce3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>