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

projects/mtg/Makefile

@@ -37,7 +37,7 @@ PSP_EBOOT_UNKPNG = pic0.png
 PSP_EBOOT_PIC1 = pic1.png
 INCDIR = ../../JGE/include ../../JGE/include/psp ../../JGE/include/psp/freetype2 ../../JGE/src ../../projects/mtg/include ../../Boost
 LIBDIR = ../../JGE/lib/psp
-CFLAGS = -O2 -G0 -DPSPFW3XX -DDEVHOOK -DUSE_PRECOMPILED_HEADERS=1 -DPSPENV
+CFLAGS = -O2 -G0 -DPSPFW3XX -DDEVHOOK -DUSE_PRECOMPILED_HEADERS=1 -DPSPENV -DPSP
 else
 OBJS += objs/TestSuiteAI.o
 INCDIR = -I../../JGE/include -I../../JGE/src -I/usr/X11/include -I../../projects/mtg/include -I../../Boost