Further cleanup: define oai_exit for 4G

The parent commit cleans up and groups oai_exit in one place,
nr-softmodem-common.h. Therefore, this 5G file is included in the 4G
defs_common.h (at least it's mostly 4G), which is not nice. Instead,
define oai_exit also in 4G softmodem-common.h, and include this in
defs_common.h. Remove the cyclic inclusion of defs_common.h in
softmodem-common.h, and resolve all subsequent errors around unknown
types and extern definition mismatches.

openair1/SIMULATION/NR_PHY/dlsim.c

@@ -107,7 +107,7 @@ int32_t uplink_frequency_offset[MAX_NUM_CCs][4];
 double cpuf;
 char *uecap_file;
 
-uint16_t sl_ahead=0;
+int sl_ahead = 0;
 //uint8_t nfapi_mode = 0;
 uint64_t downlink_frequency[MAX_NUM_CCs][4];
 THREAD_STRUCT thread_struct;

openair1/SIMULATION/NR_PHY/prachsim.c

@@ -83,7 +83,7 @@ openair0_config_t openair0_cfg[MAX_CARDS];
 //uint8_t nfapi_mode=0;
 uint64_t downlink_frequency[MAX_NUM_CCs][4];
 int32_t uplink_frequency_offset[MAX_NUM_CCs][4];
-uint16_t sl_ahead = 0;
+int sl_ahead = 0;
 uint32_t N_RB_DL = 106;
 
 NR_IF_Module_t *NR_IF_Module_init(int Mod_id) { return (NULL); }

openair1/SIMULATION/NR_PHY/ulsim.c

@@ -106,9 +106,9 @@ RAN_CONTEXT_t RC;
 char *uecap_file;
 int32_t uplink_frequency_offset[MAX_NUM_CCs][4];
 
-uint16_t sf_ahead=4 ;
+int sf_ahead = 4;
 int slot_ahead=6 ;
-uint16_t sl_ahead=0;
+int sl_ahead = 0;
 double cpuf;
 //uint8_t nfapi_mode = 0;
 uint64_t downlink_frequency[MAX_NUM_CCs][4];