core/crypto: Add has_rand_bytes

This allows runtime detection as to if `rand_bytes` is supported or not,
and lets us enable the test-case on all of the supported targets.

core/crypto/rand_js.odin

@@ -18,3 +18,7 @@ _rand_bytes :: proc(dst: []byte) {
 		dst = dst[to_read:]
 	}
 }
+
+_has_rand_bytes :: proc () -> bool {
+	return true
+}