Fix build with opaque RSA in LibreSSL 3.5.

Index: lib/mega.c
--- lib/mega.c.orig
+++ lib/mega.c
@@ -787,7 +787,7 @@ static gboolean rsa_key_gen(struct rsa_key *k)
 		return FALSE;
 	}
 
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
 	const BIGNUM *p, *q, *d, *u, *m, *_e;
 	RSA_get0_key(key, &m, &_e, &d);
 	RSA_get0_factors(key, &q, &p);