Remove unnecessary mutex from C++ socket code

Summary: This is a threadsafe syscall, as it turns out.

Reviewed By: hzhao

Test Plan: Thrift Client C++ sockets don't lock


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665384 13f79535-47bb-0310-9956-ffa450edef68
1 file changed