[Lzip-bug] Change the version of liblz.so

[Juan Francisco Cantero Hurtado]

I need to change the X.Y in liblz.so.X.Y. On OpenBSD, we don't use the 
upstream's version numbers in libs. It eases the updates of the 
dependencies.

I've saw pkgversion and soversion within configure but changing these 
options will break the internal checks of the testsuite and minilzip.

So, let me know how to change the version of liblz.so without to break 
everything :)