[CMake] elseif request

[Brandon J. Van Every]

Philip Lowman wrote:
>
> Requiring the user to specify "else(cond1)" and "endif(cond1)" may
> prevent a few mistakes but it also gets kinda annoying as conditionals
> get longer or change.

Agreed on being annoying as things get longer.  It's a tradeoff between 
safety and brevity.

It's *SUPPOSED* to annoy you when the conditional gets changed.  That's 
the point!  If you don't like it, you're saying you don't like the 
safety it provides.


Cheers,
Brandon Van Every