pgsql: Allow --with-bonjour to work with non-macOS implementations of B

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: /messages/by-id/2D8331C5-D64F-44C1-8717-63EDC6EAF7EB@brightforge.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/9b9cb3c4534d717c1c95758670198ebbf8a20af2

Modified Files
--------------
configure | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
configure.in | 6 ++++--
2 files changed, 62 insertions(+), 2 deletions(-)

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