Fix macro-redefinition warning introduced by aeb07c55f.

Some platforms provide a definition of unreachable() in standard C
headers, leading to a conflict with unreachable() in the new
timezone code.  It seems best for our purposes to conform to what
pg_unreachable() does, so #undef away the platform version.

Reported-by: Tristan Partin <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/85656c1bef4af031f8e9801d927cdaeaaae95566

Modified Files
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src/timezone/private.h | 2 ++
1 file changed, 2 insertions(+)

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