add missing #ifndef #endif guards in header file

	modified:   targets/COMMON/openairinterface5g_limits.h

targets/COMMON/openairinterface5g_limits.h

+#ifndef OPENAIRINTERFACE5G_LIMITS_H_
+#define OPENAIRINTERFACE5G_LIMITS_H_
+
 #if defined(CBMIMO1) || defined(EXMIMO) || defined(OAI_USRP)
 	#define NUMBER_OF_eNB_MAX 1
 	#define NUMBER_OF_UE_MAX 16
@@ -18,3 +21,5 @@
 		#define NUMBER_OF_CONNECTED_eNB_MAX 1 // to save some memory
 	#endif
 #endif
+
+#endif