free ldfile search paths

	* ldfile.c (ldfile_remap_input_free): Make static, call from..
	(ldfile_free): ..here.  New function.
	(ldfile_library_path_free, ldfile_script_free),
	( ldfile_arch_free): New functions.
	(ldfile_find_command_file): Free script_dir.  Move
	script_search to file scope.
	(ldfile_open_command_file_1): Delete FIXME comment.
	* ldfile.h (ldfile_remap_input_free): Delete.
	(ldfile_free): Declare.
	* ldlang.c (lang_finish): Update.