random-util: optionally allow randomness to be generated via RDRAND

We only use this when we don't require the best randomness. The primary
usecase for this is UUID generation, as this means we don't drain
randomness from the kernel pool for them. Since UUIDs are usually not
secrets RDRAND should be goot enough for them to avoid real-life
collisions.

src/libsystemd/sd-id128/sd-id128.c

@@ -272,7 +272,9 @@ _public_ int sd_id128_randomize(sd_id128_t *ret) {
 
         assert_return(ret, -EINVAL);
 
-        r = genuine_random_bytes(&t, sizeof t, 0);
+        /* We allow usage if x86-64 RDRAND here. It might not be trusted enough for keeping secrets, but it should be
+         * fine for UUIDS. */
+        r = genuine_random_bytes(&t, sizeof t, RANDOM_ALLOW_RDRAND);
         if (r < 0)
                 return r;