pgsql: pg_upgrade: avoid ALTER COLUMN TYPE on inherited columns

pg_upgrade: avoid ALTER COLUMN TYPE on inherited columns

This only affects upgrades from 8.3 currently, and is harmless as the
child just generates an error in the script, but we should get it right
in case we ever need this for more complex uses.

Per report from Peter Eisentraut

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/dbd786bc4f497210551a7640ee2f6afe877cc3e9

Modified Files
--------------
contrib/pg_upgrade/version_old_8_3.c | 4 ++++
1 file changed, 4 insertions(+)

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