Completely remove RAND_egd support

The EGD daemon is completely unmaintained and has not seen a release
since 13 years which is not an acceptable timeframe for cryptographic
software. It is not packaged in any linux distribution I know of
and definitely not in *BSD.

LibreSSL has already dropped support for RAND_egd.

lib/krb5/crypto-rand.c

@@ -67,22 +67,8 @@ seed_something(void)
     /* Calling RAND_status() will try to use /dev/urandom if it exists so
        we do not have to deal with it. */
     if (RAND_status() != 1) {
-#if defined(HAVE_RAND_EGD)
-	krb5_context context;
-	const char *p;
-
-	/* Try using egd */
-	if (!krb5_init_context(&context)) {
-	    p = krb5_config_get_string(context, NULL, "libdefaults",
-				       "egd_socket", NULL);
-	    if (p != NULL)
-		RAND_egd_bytes(p, ENTROPY_NEEDED);
-	    krb5_free_context(context);
-	}
-#else
 	/* TODO: Once a Windows CryptoAPI RAND method is defined, we
 	   can use that and failover to another method. */
-#endif
     }
 
     if (RAND_status() == 1)	{