* src/filesystem/Makefile.am: Add cxx11_abi_sources.
	* src/filesystem/Makefile.in: Regenerate.
	* src/filesystem/cow-dir.cc: New.
	* src/filesystem/cow-ops.cc: New.
	* src/filesystem/cow-path.cc: New.
	* src/filesystem/dir.cc: Define macro for new ABI.
	* src/filesystem/ops.cc: Likewise.
	* src/filesystem/path.cc: Likewise.

From-SVN: r228437