pgsql: pg_upgrade: Add C comment about NextXID delimiter

pg_upgrade: Add C comment about NextXID delimiter

We don't test the catversion for the NextXID delimiter change, we just
test the string contents; explain why.

Reported-by: Michael Paquier

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/13a6fa3634a70f58e043c78984cd2fb626abcc16

Modified Files
--------------
src/bin/pg_upgrade/controldata.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

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