libjit now using libtool

I've modified the libjit build system in CVS to use libtool for shared library 
support.

This is my first big attempt at using libtool in a real project (ignoring the 
half-hearted attempt with pnetlib/Xsharp), so it is likely that I have missed 
something.  I would appreciate it if people could check out the CVS version 
on your platform of choice and test it (and better yet, submit patches for 
the broken stuff :-) ).

Libjit is quickly getting to the "bascially useful" point, with Dynamic Pascal 
able to run useful applications now; especially the most important 
application of all:

    program Hello;
    begin
        WriteLn("Hello World!");
    end.

:-)  It can do a lot more than that of course: functions, local variables, if, 
while, record types, etc, are fairly stable with the interpreted back end 
(x86 coming RSN).

I'll need lots of testers very soon to help write test cases to exercise all 
of libjit's functionality.

Cheers,

Rhys.