cleaning the generic module :)

[Frederic-Emmanuel PICCA]

>With your version of glibc on linux; who knows about the other versions, 
>and the other operating systems...
>
>  
>

Yes with my version of glibc. But as features.h says thoses constant are 
defined by the user or the compiler.
So for generic I propose to remove all those FLAGS and let the user 
defining by himself which constant he wants.

>Personally I'd just stick to defining whatever the current build system defines,
>to avoid having to understand all that stuff :)
>  
>
As thoses Constant are platform specific, I am wondering if scons is 
dealing with it for us.
I will investigate. If not meabe it would be interesting to create a 
platform module for this purpose.

See you.