libtool: don't set auxscriptsdir at bootstrap time.

libtool: don't set auxscriptsdir at bootstrap time.

* build-aux/ltmain.in: Declare relative paths to aux scripts from
source commands, for early inlining during bootstrap.
* Makefile.am (bootstrap_edit): Move auxscriptsdir
substitution from here....
(configure_edit): ...to here.
($(ltmain_sh)): Feed ltmain.in through inline-source as ltmain.sh
is generated to remove relative paths to aux scripts.
(install-data-local): Simplify. No need for special treatment for
ltmain.sh during installation, since aux scripts have already
been inlined.
Reported by Peter Rosin.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>