Removed unneeded includes.

src/event.c

@@ -8,7 +8,6 @@
  *  the Free Software Foundation, either version 3 of the License, or
  *  (at your option) any later version.
  */
-#include <stdio.h>
 #include <string.h>
 
 #include "event.h"

src/log.c

@@ -11,9 +11,6 @@
 #include <string.h>
 #include <time.h>
 #include <errno.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
 #include "strbuf.h"
 #include "log.h"
 

src/rbtree.c

@@ -11,7 +11,6 @@
  *   http://www.eternallyconfuzzled.com/tuts/datastructures/jsw_tut_rbtree.aspx
  */
 #include <stdlib.h>
-#include <string.h>
 #ifdef __DEBUG__
 #include <assert.h>
 #include <stdio.h>