Switch uses of <dirent.h> to <folly/portability/Dirent.h>

Summary: Diff #5 of 14.

Reviewed By: mzlee

Differential Revision: D3186885

fbshipit-source-id: 1947656137cad62a019cdf687cff9913bcecde2a

folly/test/SubprocessTest.cpp

@@ -18,7 +18,6 @@
 
 #include <unistd.h>
 #include <sys/types.h>
-#include <dirent.h>
 
 #include <boost/container/flat_set.hpp>
 #include <glog/logging.h>
@@ -33,6 +32,7 @@
 #include <folly/gen/String.h>
 #include <folly/experimental/TestUtil.h>
 #include <folly/experimental/io/FsUtil.h>
+#include <folly/portability/Dirent.h>
 
 using namespace folly;