use older cmake version

cmake_targets/CMakeLists.txt

@@ -1076,7 +1076,7 @@ add_boolean_option(TRACE_RLC_UM_TX_STATUS  False "TRACE for RLC UM, TO BE CHANGE
 #add_boolean_option(PDCP_USE_NETLINK_QUEUES     False "When PDCP_USE_NETLINK is true, incoming IP packets are stored in queues")
 #add_boolean_option(LINK_ENB_PDCP_TO_IP_DRIVER  False "For eNB, PDCP communicate with a IP driver")
 #add_boolean_option(LINK_ENB_PDCP_TO_GTPV1U     True  "For eNB, PDCP communicate with GTP-U protocol (eNB<->S-GW)")
-add_compile_definitions(NEW_GTPU)
+add_definitions(-DNEW_GTPU=1)
 
 ##########################
 # RRC LAYER OPTIONS