Merging r343369:

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r343369 | vitalybuka | 2018-09-28 19:17:12 -0700 (Fri, 28 Sep 2018) | 1 line

[cxx2a] Fix warning triggered by r343285
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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/branches/release_70@348453 91177308-0d34-0410-b5e6-96231b3b80d8

src/filesystem/operations.cpp

diff --git a/src/filesystem/operations.cpp b/src/filesystem/operations.cpp
index 65a4b31..c9396b5 100644
--- a/src/filesystem/operations.cpp
+++ b/src/filesystem/operations.cpp
@@ -352,7 +352,6 @@
 
   ~FileDescriptor() { close(); }
 
-  FileDescriptor() = default;
   FileDescriptor(FileDescriptor const&) = delete;
   FileDescriptor& operator=(FileDescriptor const&) = delete;