fallout of cleaning-up libutils includes

Test: run & compile
Bug: n/a
Change-Id: I0f6a0be03f4b120b1b5876aae0c0618c025d9f2b
diff --git a/tools/aapt/ZipEntry.h b/tools/aapt/ZipEntry.h
index 287a540..669e739 100644
--- a/tools/aapt/ZipEntry.h
+++ b/tools/aapt/ZipEntry.h
@@ -26,6 +26,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <time.h>
 
 namespace android {