* libltdl/Makefile.am (install-data-local): Don't force v7 tar

* libltdl/Makefile.am (install-data-local): Don't force v7 tar
format with the `o' flag in create mode.
Set the umask to 0 when untarring to avoid copied files taking
their mode from the installer's umask.
* libltdl/loaders/Makefile.am (install-data-local): Ditto.
* libtoolize.m4sh (func_copy_cb): Ditto.
Ignore errors from failed `cd' in the tar processes, since we
may be running in dryrun mode.
Reported by Noah Misch <noah@cs.caltech.edu>,
	Bob Friesenhahn <bfriesen@simple.dallas.tx.us>