atomic: No raw 64bit load/store on 32bit systems or anything but x86_64 or s390x.

Raw 64 bit load and store need two intructions on 32bit systems (tearing) so
they are not atomic, and only x86(_64) and s390(x) have stong mempry ordering
guarantees. Always use builtin functions for the cases where raw load/store
don't work as expected.

* atomic/unix/builtins.c, atomic/unix/builtins64.c:
  Use an accept-list rather than a reject-list to define WEAK_MEMORY_ORDERING.
  Test APR_SIZEOF_VOIDP < 8 to force usage of __sync builtins for _read{32,64}
  and _set{32,64} on 32bit systems when __atomic_{load,store} buitlins are not
  available.



git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1907637 13f79535-47bb-0310-9956-ffa450edef68

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