add missing include

Summary:
Newer versions of boost fail without this. I guess mutex.hpp doesn't
include lock_guard.hpp indirectly anymore, or something.

Test Plan:
built on OS X. This was part of what I had to do for my OS
X-building attempts from a few weeks ago.

Reviewed By: delong.j@fb.com

FB internal diff: D830157

diff --git a/folly/detail/ThreadLocalDetail.h b/folly/detail/ThreadLocalDetail.h
index 537e6b6b7e763ec6447fcb0fa9b96be11880a70e..205d2e521763728689f3fc7a845a00a9377ad1d0 100644 (file)
--- a/folly/detail/ThreadLocalDetail.h
+++ b/folly/detail/ThreadLocalDetail.h
@@ -23,6 +23,7 @@
 #include <string>
 #include <vector>
 
+#include <boost/thread/locks.hpp>
 #include <boost/thread/mutex.hpp>
 
 #include <glog/logging.h>