pgsql: Still further adjust degree-based trig functions for more portab

Still further adjust degree-based trig functions for more portability.

Indeed, the non-static declaration foreseen in my previous commit message
is necessary. Per Noah Misch.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/360f67d31a5656991122b89c9ca22a860f41512c

Modified Files
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src/backend/utils/adt/float.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

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