make clang 3.7 happy, shorter, simpler too

Summary: Fixes facebook#97
make clang 3.7 happy, shorter, simpler too

Reviewed By: uddipta

Differential Revision: D2553825

fb-gh-sync-id: ef295974009f3f051967bad300a0dc8bfb12ff00

Author: ldemailly

Sender.cpp

@@ -330,7 +330,7 @@ ErrorCode Sender::start() {
             << ports_ << "]";
   startTime_ = Clock::now();
   downloadResumptionEnabled_ = options.enable_download_resumption;
-  dirThread_ = std::move(dirQueue_->buildQueueAsynchronously());
+  dirThread_ = dirQueue_->buildQueueAsynchronously();
   if (twoPhases) {
     dirThread_.join();
   }

TransferLogManager.cpp

@@ -252,8 +252,7 @@ void TransferLogManager::openLog() {
   }
   if (!options.resume_using_dir_tree) {
     // start writer thread
-    writerThread_ =
-        std::move(std::thread(&TransferLogManager::writeEntriesToDisk, this));
+    writerThread_ = std::thread(&TransferLogManager::writeEntriesToDisk, this);
     LOG(INFO) << "Log writer thread started";
   }
 }