[cmake-developers] Ninja RC cmcldeps regression

[Nils Gladitz]

Ninja on windows invokes the resource compiler through cmcldeps.

When passing ${CMAKE_BINARY_DIR} as an include directory CMake used to 
(3.0) add the absolute path to the command line; now "-I." is being 
added instead.

The relative path does not seem to work in context of cmcldeps/rc since 
headers in ${CMAKE_BINARY_DIR} aren't found anymore.

Nils