libmtp: fix build error with glibc 2.23

src/util.h

 /*
  * \file util.h
  * Utilityfunctions.
  *
  * Copyright (C) 2005-2007 Linus Walleij <triad@df.lth.se>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the
  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 02111-1307, USA.
  */
 
 #ifndef __MTP__UTIL__H
 #define __MTP__UTIL__H
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 void data_dump(FILE *f, void *buf, uint32_t nbytes);
 void data_dump_ascii (FILE *f, void *buf, uint32_t n, uint32_t dump_boundry);
 #ifndef HAVE_STRNDUP
 char *strndup (const char *s, size_t n);
 #endif
 
 /**
  * Info macro
  */
 #define LIBMTP_INFO(format, args...) \
@@ skipping 10 matching lines @@
 #define LIBMTP_ERROR(format, args...) \
   do { \
     if (LIBMTP_debug != 0) \
       fprintf(stderr, "LIBMTP %s[%d]: " format, __FUNCTION__, __LINE__, ##args); \
         else \
       fprintf(stderr, format, ##args); \
   } while (0)
 
 
 #endif //__MTP__UTIL__H