Specify test target if we build without OpenSSL.

When we decide we can't use the versions of OpenSSL available, also
restrict the tests we run to avoid the ones that need OpenSSL.

.github/configs

@@ -313,6 +313,9 @@ if [ -z "${LIBCRYPTOFLAGS}" ]; then
 			*) LIBCRYPTOFLAGS="--with-ssl-dir=${i}" ;;
 		esac
 	done
+	if [ "${LIBCRYPTOFLAGS}" = "--without-openssl" ]; then
+		TEST_TARGET="t-exec"
+	fi
 fi
 
 CONFIGFLAGS="${CONFIGFLAGS} ${LIBCRYPTOFLAGS}"