Tests: fixed grpc_ssl.t prerequisites.
diff --git a/grpc_ssl.t b/grpc_ssl.t
index 06226fd..2f67df7 100644
--- a/grpc_ssl.t
+++ b/grpc_ssl.t
@@ -24,7 +24,7 @@
 select STDOUT; $| = 1;
 
 my $t = Test::Nginx->new()->has(qw/http rewrite http_v2 grpc/)
-	->has(qw/upstream_keepalive http_ssl/);
+	->has(qw/upstream_keepalive http_ssl/)->has_daemon('openssl');
 
 $t->{_configure_args} =~ /OpenSSL ([\d\.]+)/;
 plan(skip_all => 'OpenSSL too old') unless defined $1 and $1 ge '1.0.2';