Include time.h in time_support.h.

For time_t and struct tm.

BUG=595118

Change-Id: I6c7f05998887ed2bd3fb56c83ac543894ef27fe6
Reviewed-on: https://boringssl-review.googlesource.com/7462
Reviewed-by: Emily Stark (Dunn) <estark@google.com>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/include/openssl/time_support.h b/include/openssl/time_support.h
index cec430d..274b17d 100644
--- a/include/openssl/time_support.h
+++ b/include/openssl/time_support.h
@@ -60,6 +60,7 @@
 
 #include <openssl/base.h>
 
+#include <time.h>
 
 #if defined(__cplusplus)
 extern "C" {