Add includes for <time.h>.

diff --git a/dlls/wininet/http.c b/dlls/wininet/http.c
index 76ed99a..bfba5c4 100644
--- a/dlls/wininet/http.c
+++ b/dlls/wininet/http.c
@@ -29,6 +29,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>
+#include <time.h>
 
 #include "internet.h"