macro_log_feature : setting max version

[Valentin Rusu]

Hello,

This issue is triggered by kopete's OTR plugin that stopped compiling with 
LibOTR 4.0.0 because it undergone some imported structure changes.

Pali Rohar managed to modify the FindLibOTR.cmake, we now set-up a version 
range starting with 3.2.0 (initial requirement) to 4.0.0 and kopete compiles 
by excluding the offending, too recent, LibOTR.

However, the final cmake status outputs this :

-----------------------------------------------------------------------------
-- The following OPTIONAL packages could NOT be located on your system.
-- Consider installing them to enable more features from this software.
-----------------------------------------------------------------------------
   * libotr (3.2.0 or *higher*)  <http://www.cypherpunks.ca/otr>
     A library to encrypt messages with Off-the-Record encryption (versions 
3.2.0 to 4.0.0)
     Required for the Kopete otr plugin.

I think tat a more elegant output message would state :

* libotr (3.2.0 to 4.0.0)

But the macro does not have a _maxVersion parameter. How about adding it? 
Would it be OK to add such a parameter? 


-- 
Valentin Rusu (vrusu)
IRC: valir