[CMake] Contribute Find-module to CMake vs Config-file to upstream

[Paul Fultz II]

> On May 24, 2018, at 8:07 AM, Brad King <brad.king at kitware.com> wrote:
> 
> On 05/22/2018 10:06 PM, Paul Fultz II wrote:
>> Or pkg-config could be extended to fix the issues.
> 
> The `.pc` file format is too flat to lend itself well to representing
> all the information we need.  

What do you mean? What information can’t be represented?