Creating log_internal.h for log_*put_internal() prototypes

Fixed warning "no previous prototype for function" in log_posix.c

libnfc/log_posix.c

@@ -17,11 +17,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  */
 
-#include "log.h"
+#include "log_internal.h"
 
-#include <stdlib.h>
-#include <stdint.h>
-#include <inttypes.h>
 #include <stdio.h>
 #include <stdarg.h>