Dirty CMake master content in install directory

[Stephen Kelly]

Hello,

If you use CMake master, then you may have unused stuff in your install 
directory versioned by commit sha:

 http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/8433

The issue is resolved in the CMake next branch, and will be merged to master 
next week probably.

Thanks,

Steve.