delete bsearch.c and bsearch.h from source tree

they are not referenced in CMakeLists.txt (so says grep)

openair2/RRC/LITE/MESSAGES/bsearch.c

-/*
- * A generic implementation of binary search for the Linux kernel
- *
- * Copyright (C) 2008-2009 Ksplice, Inc.
- * Author: Tim Abbott <tabbott@ksplice.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; version 2.
- */
-
-#include <linux/module.h>
-#include "bsearch.h"
-
-/*
- * bsearch - binary search an array of elements
- * @key: pointer to item being searched for
- * @base: pointer to data to sort
- * @num: number of elements
- * @size: size of each element
- * @cmp: pointer to comparison function
- *
- * This function does a binary search on the given array.  The
- * contents of the array should already be in ascending sorted order
- * under the provided comparison function.
- *
- * Note that the key need not have the same type as the elements in
- * the array, e.g. key could be a string and the comparison function
- * could compare the string with the struct's name field.  However, if
- * the key and elements in the array are of the same type, you can use
- * the same comparison function for both sort() and bsearch().
- */
-void *bsearch(const void *key, const void *base, size_t num, size_t size,
-              int (*cmp)(const void *key, const void *elt))
-{
-  int start = 0, end = num - 1, mid, result;
-
-  if (num == 0) {
-    return NULL;
-  }
-
-  while (start <= end) {
-    mid = (start + end) / 2;
-    result = cmp(key, base + mid * size);
-
-    if (result < 0) {
-      end = mid - 1;
-    } else if (result > 0) {
-      start = mid + 1;
-    } else {
-      return (void *)base + mid * size;
-    }
-  }
-
-  return NULL;
-}
-//EXPORT_SYMBOL(bsearch);

openair2/RRC/LITE/MESSAGES/bsearch.h

-#ifndef _LINUX_BSEARCH_H
-#define _LINUX_BSEARCH_H
-
-#include <linux/types.h>
-
-void *bsearch(const void *key, const void *base, size_t num, size_t size,
-              int (*cmp)(const void *key, const void *elt));
-
-#endif /* _LINUX_BSEARCH_H */