Fix compile error when --build-e2 option included

- modify byte_array.h in order to avoid conflict for same file names

common/utils/ds/byte_array.h

@@ -19,8 +19,10 @@
  *      contact@openairinterface.org
  */
 
-#ifndef BYTE_ARRAY_H_OAI
-#define BYTE_ARRAY_H_OAI
+#ifndef BYTE_ARRAY_H 
+#define BYTE_ARRAY_H 
+
+/* WARNING: This file is also defined at XXXXX. Both files need to be completely equal. Same applies for *.c */
 
 #include <stdbool.h>
 #include <stdint.h>
@@ -39,4 +41,6 @@ byte_array_t copy_byte_array(byte_array_t src);
 void free_byte_array(byte_array_t ba);
 bool eq_byte_array(const byte_array_t* m0, const byte_array_t* m1);
 
+byte_array_t cp_str_to_ba(const char* str);
+
 #endif