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
------
REL_18_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/936d8974c3bcf4fc7163fcd1b403eea2adffa73e

Modified Files
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src/include/port/pg_crc32c.h | 4 ++++
1 file changed, 4 insertions(+)

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