Expose tzname, daylight, and timezone.

These were accidentally hidden.

Bug: 11156955
Change-Id: I380f00bdafa547aea13d4634f3de9ec6f0b50a6f
diff --git a/libc/include/time.h b/libc/include/time.h
index a1f5260..0587a2d 100644
--- a/libc/include/time.h
+++ b/libc/include/time.h
@@ -36,9 +36,9 @@
 
 #define CLOCKS_PER_SEC 1000000
 
-extern char* tzname[];
-extern int daylight;
-extern long int timezone;
+extern char* tzname[] __LIBC_ABI_PUBLIC__;
+extern int daylight __LIBC_ABI_PUBLIC__;
+extern long int timezone __LIBC_ABI_PUBLIC__;
 
 struct sigevent;