Fix build with opaque RSA in LibreSSL 3.5.

Index: adb/adb_auth_host.c
--- adb/adb_auth_host.c.orig
+++ adb/adb_auth_host.c
@@ -82,7 +82,7 @@ static int RSA_to_RSAPublicKey(RSA *rsa, RSAPublicKey 
     }
 
     BN_set_bit(r32, 32);
-    BN_copy(n, rsa->n);
+    BN_copy(n, RSA_get0_n(rsa));
     BN_set_bit(r, RSANUMWORDS * 32);
     BN_mod_sqr(rr, r, n, ctx);
     BN_div(NULL, rem, n, r32, ctx);
@@ -96,7 +96,7 @@ static int RSA_to_RSAPublicKey(RSA *rsa, RSAPublicKey 
         BN_div(n, rem, n, r32, ctx);
         pkey->n[i] = BN_get_word(rem);
     }
-    pkey->exponent = BN_get_word(rsa->e);
+    pkey->exponent = BN_get_word(RSA_get0_e(rsa));
 
 out:
     BN_free(n0inv);