Some preparation work for new platform support.

- Added a "PSP" compile-time define to clean up some compile time checks (replaced !WIN32 && !LINUX && !IOS with PSP) 
-- Wil, I am aware that this is redundant with the PSPENV variable you introduced recently, I think we can clean that up easily
-- This looks like lots of changes, but most of the time I just moved some blocks here and there
-- tested on VC 2010, PSP, and a bit of NDK
-- I might have broken maemo, iOS, or Linux compilation, can you guys check?
- Fixed some warnings reported by NDK
- NDK still does not compile because recent boost additions (mutex, etc...) are apparently not supported

JGE/include/JSprite.h

@@ -11,10 +11,10 @@
 #ifndef _SPRITE_H_
 #define _SPRITE_H_
 
-#if defined (WIN32) || defined(LINUX) || defined(IOS)
-#include <math.h>
-#else
+#if defined (PSP)
 #include <fastmath.h>
+#else
+#include <math.h>
 #endif
 
 #include <vector>