automake -vs- BSD make

[Tom Tromey]

Could somebody with access to the BSD make please try the current cvs
automake and report back?

I've tried to implement support for `.include'.  I think it works, but
of course I'm not copmletely sure.

This new code does rely on `MAKE' being set at configure time to the
make that the user plans to use at build time.  We've avoided this for
a long time, but these days I think it is ok.  We already do this for
AC_PROG_MAKE_SET.

Tom