[COMMITTERS] pgsql: Allow --with-bonjour to work with non-macOS implementations ofB

Allow --with-bonjour to work with non-macOS implementations of Bonjour.

On macOS the relevant functions require no special library, but elsewhere
we need to pull in libdns_sd.

Back-patch to supported branches.  No docs change since the docs do not
suggest that this is a Mac-only feature.

Luke Lonergan

Discussion: https://postgr.es/m/2D8331C5-D64F-44C1-8717-63EDC6EAF7EB@brightforge.com

Branch
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REL9_3_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/9042e927eafb2b3f1d5d0c02d9640d357a5a12a7

Modified Files
--------------
configure    | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
configure.in |  6 ++--
2 files changed, 95 insertions(+), 2 deletions(-)


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