[CMake][AIX] Enable CMP0182: Create shared library archives by default (#155686)
On AIX we prefer to create shared libraries as shared library archives
(i.e. we archive the shared object in a big AR archive) as this is the
standard format on the platform.
There is now a CMake policy that allows us to do this by default, so
opt-in to that behaviour.
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Co-authored-by: Hubert Tong <hubert.reinterpretcast@gmail.com>