Mark all symbols exported from extension libraries PGDLLEXPORT.

Andres Freund <andres@anarazel.de>

Commit: 8cf64d35eaccab967c51d8bccf2c1babe3f84715
Author: Andres Freund <andres@anarazel.de>
Date: 2022-07-18T01:50:14Z
Releases: 16.0
Mark all symbols exported from extension libraries PGDLLEXPORT.

This is in preparation for defaulting to -fvisibility=hidden in extensions,
instead of relying on all symbols in extensions to be exported.

This should have been committed before 089480c0770, but something in my commit
scripts went wrong.

Author: Andres Freund <andres@anarazel.de>
Reviewed-By: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/20211101020311.av6hphdl6xbjbuif@alap3.anarazel.de

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