Use standard C99 uint8_t type instead of u_char type

[Girgias]

No description provided.

[cmb69]

Thank you! Looks reasonable. Since there are more occurrences of u_char in php-src, we cannot yet get rid of

php-src/main/php_stdint.h

Lines 45 to 49 in 08d1593

	#if defined(_MSC_VER)
	# ifndef u_char
	typedef unsigned __int8 u_char;
	# endif
	#endif /* !_MSC_VER */

But we should probably fix the erroneous typedef right away.

[Girgias]

u_char

I didn't realise this as only this failed on the other PR. But I will indeed go and fix them. Just waiting for CI to be sure this works before merging