improve `proc_open` error reporting on Windows

[determin1st]

Description

i was launching processes recently and got a Warning: "CreateProcess failed with error code 8" that is generated here:

php-src/ext/standard/proc_open.c

Line 1320 in acd31df

if (newprocok == FALSE) {

	if (newprocok == FALSE) {
		//DWORD dw = GetLastError();
		close_all_descriptors(descriptors, ndesc);
		//php_error_docref(NULL, E_WARNING, "CreateProcess failed, error code: %u", dw);
		php_win32_docref1_from_error(
			GetLastError(), ZSTR_VAL(command_str)
		);
		goto exit_fail;
	}

ive replaced php_error_docref function with windows specific function which said that was a lack of memory, instead of code 8. so kind of tested it.

[cmb69]

Oh, indeed, we should use php_win32_error_to_msg() what's similar to POSIX' strerror().

[cmb69]

#15687 has been merged, so this can be closed (would have been automatically, if I hadn't screwed up).