Add missing guard for __builtin_constant_p

Oversight in commit e2809e3a1. While at it, use pg_integer_constant_p
in master.

Discussion: 
https://postgr.es/m/canwcazboha-x5mcreqn3tra56vdkwnmakmy3fav1kjsw9vp...@mail.gmail.com
Backpatch-through: 18

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/6766264262851686481dee4401541ee8cd874c2a

Modified Files
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src/include/port/pg_crc32c.h | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

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