pg_freespacemap: Use SQL-standard function bodies

Michael Paquier <michael@paquier.xyz>

Commit: 3f323eba89fb1ea2220cfe48ea7d9529fffe5cb6
Author: Michael Paquier <michael@paquier.xyz>
Date: 2024-11-12T08:28:03Z
Releases: 18.0
pg_freespacemap: Use SQL-standard function bodies

72a5b1fc8804 was the piece missing for the conversion of this module.
pg_freespace is bumped to 1.3, with its function pg_freespace(regclass)
converted to this new style.

There are other modules in the tree that need a similar treatment; these
will be handled later.

Author: Tom Lane
Reviewed-by: Ronan Dunklau
Discussion: https://postgr.es/m/3395418.1618352794@sss.pgh.pa.us

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