[CMake] case in IF statements

[Karl Merkley]

I'm playing with cmake 2.4-2.   I read recently that had been changed  
to accept lower case arguments  (if instead of IF).  However, it  
appears that modifiers within the IF statement still must be upper  
cased.  For example,  if (NOT UNIX)  appears to work but if (not  
UNIX) fails.   I noticed the same behavior with AND, MATCHES and  
STREQUAL in an IF statement.    Is this by design or is it a bug?

     Karl