pgsql: Avoid unreferenced-function warning on low-functionality platfor

Avoid unreferenced-function warning on low-functionality platforms.

On platforms lacking both locale_t and ICU, collationcmds.c failed
to make any use of its static function is_all_ascii(), thus probably
drawing a compiler warning. Oversight in my commit ddb5fdc06.
Per buildfarm member gaur.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/ec4073f64130b40fabaa1b38ad402babda3a48eb

Modified Files
--------------
src/backend/commands/collationcmds.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

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