Add WT_STATIC_ASSERT calls to the atomic operation macros so we don't
accidentally call the wrong size macro.
We don't yet need anything other than single-byte versions of the
atomic flag operations, simplify the world.
typo, repeated #define.
Merge pull request #1257 from wiredtiger/check-atomic-sizes

Add WT_STATIC_ASSERT calls to the atomic operation macros so we don't choose the wrong macro.