Fix `mktime` handling on new glibc
Fix `mktime` handling on new glibc

Summary: Older versions would just quietly accept invalid `is_dst` values. The new version actually errors out. The new Bistro code handles both cases.

Reviewed By: nilesr

Differential Revision: D26059655

fbshipit-source-id: 8d3b370e41608a2821ac3ad5ad01fd8e927ef810

facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro