Parrot config - a small perl task

[Leopold Toetsch]

Our types configuration is still using perl5's type sizes. This breaks 
default Configure.pl runs on various architectures, that ship a perl 
with "long long" intvals.

Using perl's was needed a long time ago, when packfiles were generated 
by perl. It's not needed any more.

So the job is to fix that and use the natural wordsize of the machine:
On (AFAIK) all systems: opcode_type = intval_type = long. This size has 
to match the pointer size. And floatval_type = double.

Thanks,
leo