Silence warnings about unused global variables

Similar to commit "Remove unused global variables", silence
-Wunused-but-set-global warnings from clang 23 (included in -Wall).
These are variables that are used in assert-enabled builds only, so
annotate them with PG_USED_FOR_ASSERTS_ONLY.

Branch
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REL_15_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/9dc7554abe4c7a545c9546ee61dfc53a21cbb454

Modified Files
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src/backend/utils/cache/syscache.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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