stlport4 and _XOPEN_SOURCE

Using -library=stlport4 automatically defines _XOPEN_SOURCE=500 in config/stl_sunpro.h. This is quite confusing as it disables the definition of the macros _BSD_SOURCE and _SVID_SOURCE in features.h on linux. This way we get an inconsistant behavior between Cstd where a function like "finite" is declared and stlport4 where it is not. If it is not convenient to fix it, maybe at least adding a note about it somewhere?

[426 byte] By [Marc_Glissea] at [2007-11-26 23:39:00]