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/src/utils.cpp

@@ -59,7 +59,14 @@ int WRand()
 int filesize(const char * filename)
 {
     int file_size = 0;
-#if defined (WIN32) || defined (LINUX) || defined (IOS)
+#if defined (PSP)
+    int file = sceIoOpen(filename, PSP_O_RDONLY, 0777);
+    if (file > 0)
+    {
+        file_size = sceIoLseek(file, 0, PSP_SEEK_END);
+        sceIoClose(file);
+    }
+#else
     FILE * file = fopen(filename, "rb");
     if (file != NULL)
     {
@@ -67,15 +74,6 @@ int filesize(const char * filename)
         file_size = ftell(file);
         fclose(file);
     }
-
-#else
-    int file = sceIoOpen(filename, PSP_O_RDONLY, 0777);
-    if (file > 0)
-    {
-        file_size = sceIoLseek(file, 0, PSP_SEEK_END);
-        sceIoClose(file);
-    }
-
 #endif
     return file_size;
 }