[CWB] Cannot build CWB::CL

[Hardie, Andrew]

> @Andrew: is there documentation on API changes from 3.0 to 
> 3.2? 

Only in the comments to cl.h (some of which are in the Doxygen HTML).  I
did my level best to make sure there would only be minimal API changes;
the biggest exception is cl_string_canonical for obvious reasons.

> If we expect the two versions to coexist

I don't think we should. If people are pre-Unicode, they should be
working with *everything* pre-Unicode, ie both CWB and CWB-Perl 3.0 or
earlier. And if they're post-Unicode, they need both CWB 3.2+ and a
compatible CWB-Perl.

Andrew.