BUILD: memory: fix pointer declaration for atomic CAS

BUILD: memory: fix pointer declaration for atomic CAS

The calls to HA_ATOMIC_CAS() on the lockfree version of the pool allocator
were mistakenly done on (void*) for the old value instead of (void **).
While this has no impact on "recent" gcc, it does have one for gcc < 4.7
since the CAS was open coded and it's not possible to assign a temporary
variable of type "void".

No backport is needed, this only affects 1.9.