* src/prototypes.h (str_safe_copy): newly added.
(build_standard_archive_name, build_backup_file):
added argument the size for build_standard_archive_name() and
build_backup_file().
* src/header.c (init_header): use str_safe_copy() instead of strcpy().
* src/lhadd.c (build_backup_file, cmd_add, cmd_delete):
added argument the size for build_standard_archive_name() and
build_backup_file().
* src/lhext.c (make_parent_path): use str_safe_copy() instead of strcpy().
(extract_one): ditto.
* src/lharc.c (find_files): use str_safe_copy() instead of strcpy().
(build_temporary_name): ditto.
(modify_filename_extention): ditto.
(build_backup_name): ditto.
(build_standard_archive_name): ditto.
* src/header.c (wintime_to_unix_stamp): no use 64bit constant to
avoid the warning `integer constant is too large for "long" type'
on GCC. however, for portability, no use the unsigned long long
suffix "ULL".
