Include <sys/time.h> in packeted_bio.h for 'timeval'

At least for newlib (Native Client) including sys/types.h
is not enough to get a timeval declaration.

Change-Id: I4971a1aacc80b6fdc12c0e81c5d8007ed13eb8b7
Reviewed-on: https://boringssl-review.googlesource.com/6722
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/test/packeted_bio.h b/ssl/test/packeted_bio.h
index 30697a5..75cfa13 100644
--- a/ssl/test/packeted_bio.h
+++ b/ssl/test/packeted_bio.h
@@ -25,7 +25,7 @@
 #include <winsock2.h>
 #pragma warning(pop)
 #else
-#include <sys/types.h>
+#include <sys/time.h>
 #endif