geos
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Remove RETURN_UNIQUE_PTR
This shim to get around warnings for GCC <= 4.9 may have outlived its day. Certainly we have no shortage of unshimmed returns of std::unique_ptr at this point.
What gcc 4.9 does not deal with is returning a value of type std::unique_ptr<CoordinateArraySequence> from a function with return type std::unique_ptr<CoordinateSequence>. Dropping support for an 8-year old compiler seems reasonable, though.