[CMake] cmake overwriting DartConfiguration.tcl

[Brad King]

Tom Hosiawa wrote:
> Is there a way to turn of cmake automatically regenerating
> DartConfiguration.tcl when it's run?
> 
> The default one always points to kitware, and after I edit it, run
> cmake, it's back to the default one.

DartConfiguration.tcl is a generated file.  You need to edit the input 
to this generation to prevent it from changing.  Look for a 
DartConfig.cmake in the source tree.

-Brad