Use posix_memalign instead of mmap for creating the locking pool

As described in #602, using mmap with fork causes problems because
the mmap remains shared in the child instead of being copy-on-write,
then the parent and child stomp on each others memory.

However we really do not need mmap semantics, we just want a block of
memory that is page-aligned, which can be done with posix_memalign
instead. This was added in POSIX.1-2001 and seems to be implemented by
all modern systems.

Closes #602

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