cleanup: no variable definition in header file

We declare variables in header files, we don't define them. So we need
to use 'extern' in the header file and put the definition
in some C file.

openair2/RRC/LTE/rrc_eNB.c

@@ -116,6 +116,10 @@ extern int rrc_eNB_process_security(const protocol_ctxt_t *const ctxt_pP, rrc_eN
 extern void process_eNB_security_key (const protocol_ctxt_t *const ctxt_pP, rrc_eNB_ue_context_t *const ue_context_pP, uint8_t *security_key_pP);
 extern int derive_keNB_star(const uint8_t *kenb_32, const uint16_t pci, const uint32_t earfcn_dl, const bool is_rel8_only, uint8_t * kenb_star);
 
+pthread_mutex_t      rrc_release_freelist;
+RRC_release_list_t   rrc_release_info;
+pthread_mutex_t      lock_ue_freelist;
+
 void
 openair_rrc_on(
   const protocol_ctxt_t *const ctxt_pP

openair2/RRC/LTE/rrc_proto.h

@@ -667,9 +667,11 @@ void openair_rrc_top_init_ue(
                         uint8_t cba_group_active,
                         uint8_t HO_active
 );
-pthread_mutex_t      rrc_release_freelist;
-RRC_release_list_t rrc_release_info;
-pthread_mutex_t      lock_ue_freelist;
+
+extern pthread_mutex_t      rrc_release_freelist;
+extern RRC_release_list_t   rrc_release_info;
+extern pthread_mutex_t      lock_ue_freelist;
+
 void remove_UE_from_freelist(module_id_t mod_id, rnti_t rnti);
 void put_UE_in_freelist(module_id_t mod_id, rnti_t rnti, boolean_t removeFlag);
 void release_UE_in_freeList(module_id_t mod_id);