style: define parameterless functions as foo(void).

Change pg_icu_unicode_version() to pg_icu_unicode_version(void),
introduced by commit af2d4ca191. See commit 9b05e2ec08, which fixed
similar cases.

Author: Bertrand Drouvot <[email protected]>
Reviewed-by: Chao Li <[email protected]>
Discussion: 
https://postgr.es/m/aaEhpwrj1FY/8/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/11171fe1fc833c279f78e922c7f4b98c063b932b

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

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