isnan() in combination with <cmath> breaks OS/X build

[pramsey]

At r2554 an ISNAN macro was sprinkled about the code base. The net effect in building is now this:

../../../source/headers/geos/geom/Coordinate.inl: In member function 'bool geos::geom::Coordinate::isNull() const':
../../../source/headers/geos/geom/Coordinate.inl:46: error: 'isnan' was not declared in this scope

This is a well-known problem with no simple fixes, it will involve some special-case hack-around, probably to ensure ISNAN gets bound to the right place. This thread seems to have most information (read backwards into previous posts)

 http://lists.apple.com/archives/xcode-users/2005/May/msg00792.html

[pramsey]

Fix committed to trunk at r2601. This needs testing in other operating systems to ensure the autoconf recipe doesn't catch them by mistake.

[pramsey]

Fix to the fix committed at r2603.