Faster install for libtool outputs. * lib/am/ltlib.am (install-%DIR%LTLIBRARIES): Invoke `libtool --mode=install' with multiple libraries at once. (%DIR%LTLIBRARIES_INSTALL): No need to use install_sh any more. * lib/am/progs.am (install-%DIR%PROGRAMS): Likewise, remove much of the libtool special-casing by invoking it for multiple programs at once. Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>