gwen: Changed NDEBUG to !_DEBUG

[garry]

[B]Revision 128[/B]
[INDENT]Changed NDEBUG to !_DEBUG
- _DEBUG is kind of MS specific - but there's no other standard (apparently?)
- NDEBUG is only really used to enable assert() - so we want to allow people to use that separately.[/INDENT] [B]Changed Files:[/B]
[LIST]
[*]trunk/gwen/include/Gwen/Exports.h
[/LIST]

Committed By [B]Garry Newman[/B]