* src/filesystem/ops.cc (stat_type): Define alias for struct stat and
use throughout the file.
(make_file_type): New function.
(file_size(const path&, error_code&)): Report an error for anything
that isn't a regular file.
(status(const path&), symlink_status(const path&)): Do not throw for
file_type::not_found.
(temp_directory_path()): Check additional environment variables.
* testsuite/experimental/filesystem/operations/exists.cc: New.
* testsuite/experimental/filesystem/operations/file_size.cc: New.
* testsuite/experimental/filesystem/operations/status.cc: New.
* testsuite/experimental/filesystem/operations/temp_directory_path.cc:
New.
From-SVN: r223224
Jonathan Wakely