Fix dumping of casts and transforms using built-in functions

In pg_dump.c dumpCast() and dumpTransform(), we would happily ignore the
cast or transform if it happened to use a built-in function because we
weren't including the information about built-in functions when querying
pg_proc from getFuncs().

Modify the query in getFuncs() to also gather information about
functions which are used by user-defined casts and transforms (where
"user-defined" means "has an OID >= FirstNormalObjectId").  This also
adds to the TAP regression tests for 9.6 and master to cover these
types of objects.

Back-patch all the way for casts, back to 9.5 for transforms.

Discussion: 
https://www.postgresql.org/message-id/flat/20160504183952.GE10850%40tamriel.snowman.net

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/2259bf672cb45b4104dcb835354beeb1c6105b0e

Modified Files
--------------
src/bin/pg_dump/pg_dump.c        | 46 +++++++++++++++++-----
src/bin/pg_dump/t/002_pg_dump.pl | 85 +++++++++++++++++++++++++---------------
2 files changed, 90 insertions(+), 41 deletions(-)


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