crypto.rand: fix compilation on macos with `-cc tcc -no-retry-compila…

…tion -gc none`

vlib/crypto/rand/rand_darwin.c.v

@@ -4,16 +4,14 @@
 
 module rand
 
-#include <Security/SecRandom.h>
+#include <sys/random.h>
 
-#flag darwin -framework Security
-
-fn C.SecRandomCopyBytes(rnd C.SecRandomRef, count usize, bytes voidptr) int
+fn C.getentropy(buf voidptr, buflen usize) int
 
 // read returns an array of `bytes_needed` random bytes read from the OS.
 pub fn read(bytes_needed int) ![]u8 {
 	mut buffer := []u8{len: bytes_needed}
-	status := C.SecRandomCopyBytes(C.SecRandomRef(0), bytes_needed, buffer.data)
+	status := C.getentropy(buffer.data, bytes_needed)
 	if status != 0 {
 		return &ReadError{}
 	}