Failed to compile mesos on arm64 due to leveldb lack of support for arm64

./port/atomic_pointer.h:142:2: error: #error Please implement AtomicPointer for this platform.
#error Please implement AtomicPointer for this platform.
^
Makefile:74: recipe for target 'libleveldb.so.1.4' failed

leveldb project master branch contains changes in atomic_porinter.h to support arm 64 build.

When I copy the contents of atomic_pointer.h from the leveldb master branch into the mesos expanded leveldb 1.4 port/atomic_pointer.h, the code compiles without errors. The latest leveldb release 1.18 does not support arm64 but master does.