Trust a few system headers to stand on their own

At some point in the past some headers (net/if.h on some BSDs in 2009,
netinet/tcp.h on IRIX in 2000, sys/ucred.h in 2013 on then older openbsd),
only compiled if other heades were included first, complicating configure
tests. More recent tests indicate that that's not required anymore.

Reviewed-By: Thomas Munro <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/a2a36d56b96fe17c4ad9649936dcf7406eb78cc9

Modified Files
--------------
configure    | 56 +-------------------------------------------------------
configure.ac | 24 +++---------------------
2 files changed, 4 insertions(+), 76 deletions(-)

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