* acinclude.m4 (GLIBCXX_ENABLE_FILESYSTEM_TS): Disable when <dirent.h>

	* acinclude.m4 (GLIBCXX_ENABLE_FILESYSTEM_TS): Disable when <dirent.h>
	is not available.
	(GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for fchmodat.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* configure.ac: Check for utime.h
	* include/experimental/fs_path.h (path::string<>)
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Remove stray typename keyword.
	* src/filesystem/dir.cc [!_GLIBCXX_HAVE_DIRENT_H] (DIR, opendir,
	closedir, dirent, readdir_r): Replace dummy functions with #error.
	(native_readdir, _Dir::advance): Use readdir when readdir_r is missing.
	* src/filesystem/ops.cc (do_stat, is_set): Make inline.
	(last_write_time) [!_GLIBCXX_USE_UTIMENSAT]: Use utime.
	(permissions) [!_GLIBCXX_USE_FCHMODAT]: Use chmod.
	(space, temp_directory_path) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Set
	error_code.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@222703 138bc75d-0d04-0410-961f-82ee72b054a4