[Kwintv] LAUNDRY: libzvbi autoconf check

[Neil Macvicar]

I had a look at cleaning this bit of laundry, and discovered that although the 
header file libzvbi.h contains defines for MAJOR,MINOR,MICRO, the compiled 
library has no symbol for discovering it's version. This of course leads to 
the following:

1. What is broken in the versions of libzvbi that we want to discard ? Is it 
containable within the header, i.e a function prototype change, new 
functionality, or an actual code feature ? If it's a code feature, the only 
way to check for a version of libzvbi that we can rely upon at the moment is 
to do a compile-run-fail test.

2. If the reasoning for this check is library code based, I'll ask the 
maintainer of libzvbi to commit a patch that includes the libraries version 
in the symbol table somewhere. This is more sane, and avoids header/library 
versioning mismatches.

Regards,
Neil.