The inline configuration mechanism did work properly for iterated
invocation of cmake. But since the configuration items were set after
the decision was made whether a tool was build or not, they had only
influence on the second run of cmake.
The experiment configuration is no saved in a config.cmake file, which
populates the CMakeCache.txt before any other CMakeLists.txt is read.
Change-Id: I6eca1c6e462af3a241bd9c5b9a27a71a1f5d2829
0317be8f8f