gdb/

gdb/
	* NEWS (--with-auto-load-dir): Prepend $debugdir to the default path.
	Describe it.
	* auto-load.c (auto_load_expand_dir_vars): New function.
	(auto_load_safe_path_vec_update): Use it, remove the
	substitute_path_component call thanks to it.
	(auto_load_objfile_script): Remove the debug_file_directory processing.
	Use auto_load_expand_dir_vars, remove the substitute_path_component
	call thanks to it.
	* configure: Regenerate.
	* configure.ac (--with-auto-load-dir): Prepend $debugdir to the default
	path.  Escape $ also for $debugdir.
	(--with_auto_load_safe_path): Escape $ also for $debugdir.
	* utils.c (substitute_path_component): Accept also DIRNAME_SEPARATOR.

gdb/doc/
	* gdb.texinfo (Separate Debug Files): New anchor debug-file-directory.
	Mention also --with-separate-debug-dir.
	(Auto-loading): Prepend $debugdir in the sample output.
	(Auto-loading safe path): Likewise.  Mention also $debugdir for the
	auto-load safe-path variable.
	(objfile-gdb.py file): Remove the extra debug-file-directory paragraph.
	Mention also $debugdir for 'set auto-load scripts-directory'.