add timezone to gmtime tests

Author: Зишан Мирза

libc/test/src/time/gmtime_r_test.cpp

@@ -6,6 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "src/time/timezone.h"
 #include "src/time/gmtime_r.h"
 #include "src/time/localtime.h"
 #include "src/time/time_utils.h"

libc/test/src/time/gmtime_test.cpp

@@ -8,6 +8,7 @@
 
 #include "src/__support/CPP/limits.h" // INT_MAX, INT_MIN
 #include "src/errno/libc_errno.h"
+#include "src/time/timezone.h"
 #include "src/time/gmtime.h"
 #include "src/time/localtime.h"
 #include "src/time/time_utils.h"