Use fcntl.h instead of sys/fcntl.h am: 238d904f2d am: 14a1f0fa51 am: 1528ec6303

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1931289

Change-Id: I8d71da2ecea0bed536c0afe53362f59dd4121af9