Support custom file parsing

include/PSX/jabyengine_defines.hpp

@@ -7,19 +7,10 @@
 #define __no_inline     __attribute__((noinline))
 #define __no_return     __attribute__((noreturn))
 #define __always_inline __attribute__((always_inline))
+#define __weak          __attribute__((weak))
 #define __section(name) __attribute__((section(name)))
 #define __collect(...) __VA_ARGS__
 
 #ifndef __friends
     #define __friends private
-#endif //!__friends
-
-#ifdef __cplusplus
-    #define __constexpr constexpr
-    #define START_C_FUNCTIONS extern "C" {
-    #define END_C_FUNCTIONS }
-#else
-    #define __constexpr
-    #define START_C_FUNCTIONS
-    #define END_C_FUNCTIONS
-#endif
+#endif //!__friends