Include time.h for time handling functions.

lib/zip_dirent.c

diff --git a/lib/zip_dirent.c b/lib/zip_dirent.c
index 630b6a4..74f8988 100644
--- a/lib/zip_dirent.c
+++ b/lib/zip_dirent.c
@@ -37,6 +37,7 @@
 #include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <time.h>
 
 #include "zipint.h"