Re-run mkauto.sh from within makedist.sh.

Re-run mkauto.sh from within makedist.sh.

It isn't necessary to cause the right files to _exist_, because
makedist.sh is run from Buildscr which has already run mkauto. But it
turns out it _is_ important to get the relative timestamps of
Makefile.in and Makefile.am the right way round, otherwise somebody
who unpacks the tarball and runs 'configure' and 'make' will find make
tries to rebuild Makefile.in because it thinks Makefile.am is newer -
and if they don't have the right automake installed, or any automake,
that will fail.