random: Move the CSPRNG implementation into a separate C file

[TimWolla]

The CSPRNG is a delicate and security relevant piece of code and having it in the giant random.c makes it much harder to verify changes to it. Split it into a separate file.

---

Requested @devnexen to double check that I didn't accidentally break the conditional compilation for some platform. Compared to random.c I've dropped the following headers:

#include <math.h>
#include "Zend/zend_enum.h"
# include <sys/time.h>
#include "random_arginfo.h"

Thus I'm reasonably sure the result is correct.

[Girgias]

Just nitpicking on already existing issues.

But looks good to me otherwise if the CI doesn't complain.

[Girgias]

Suggested change

	PHPAPI int php_random_bytes(void *bytes, size_t size, bool should_throw)
	PHPAPI zend_result php_random_bytes(void *bytes, size_t size, bool should_throw)

[TimWolla]

I've noticed that myself, having followed the discussion on the ML. However I've intentionally not included this change in this PR to make it immediately obvious that it's a simple moving around when diffing the files. I consider this important for "trustworthiness" / to keep a clear "audit log".

Will make the change in a dedicated follow-up commit / PR.

[Girgias]

Suggested change

	PHPAPI int php_random_int(zend_long min, zend_long max, zend_long *result, bool should_throw)
	PHPAPI zend_result php_random_int(zend_long min, zend_long max, zend_long *result, bool should_throw)

[zeriyoshi]

LGTM. That's making sense.

[devnexen]

LCTM

[TimWolla]

Thanks, y'all.