compat.sh: remove G_CLIENT_PRIO as it's not used

Signed-off-by: Yanray Wang <yanray.wang@arm.com>
diff --git a/tests/compat.sh b/tests/compat.sh
index 2c4d55b..578b185 100755
--- a/tests/compat.sh
+++ b/tests/compat.sh
@@ -932,7 +932,6 @@
     M_CLIENT_ARGS="server_port=$PORT server_addr=127.0.0.1 force_version=$MODE"
     O_CLIENT_ARGS="-connect localhost:$PORT -$O_MODE"
     G_CLIENT_ARGS="-p $PORT --debug 3 $G_MODE"
-    G_CLIENT_PRIO="NONE:$G_PRIO_MODE:+COMP-NULL:+CURVE-ALL:+SIGN-ALL"
 
     # Newer versions of OpenSSL have a syntax to enable all "ciphers", even
     # low-security ones. This covers not just cipher suites but also protocol