pgsql: pg_upgrade: suppress creation of delete script

pg_upgrade: suppress creation of delete script

Suppress creation of the pg_upgrade delete script when the new data
directory is inside the old data directory.

Reported-by: IRC

Backpatch-through: 9.3, where delete script tests were added

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/6f43c4d34844c400a159c40909ff227ca1d870cc

Modified Files
--------------
src/bin/pg_upgrade/check.c | 30 ++++++++++++++++++++++++------
1 file changed, 24 insertions(+), 6 deletions(-)

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