Header parsing issues in C++ context on Mac

[maximmenshikov]

There is an issue in utf8.h related to char32_t.
It is not needed to override char32_t in C++ context because it is defined in standard library.
This part is buggy:

#ifdef __APPLE__
	typedef uint32_t char32_t;
#else
	#include <uchar.h>
#endif

Also I believe it is required to make a small C++ wrapper library to ensure that headers can always be parsed in C++ context.