Fix compilation for the NX platform. (#334)

src/file.cpp

@@ -75,7 +75,8 @@ namespace bx
 	  || BX_PLATFORM_EMSCRIPTEN \
 	  || BX_PLATFORM_IOS        \
 	  || BX_PLATFORM_OSX        \
-	  || BX_PLATFORM_VISIONOS
+	  || BX_PLATFORM_VISIONOS   \
+		|| BX_PLATFORM_NX
 #		define fseeko64 fseeko
 #		define ftello64 ftello
 #	elif BX_PLATFORM_PS4