Some header files are not included in the code coverage instrumentation

Some headers files of the Qt modules are never instrumented because their are not part of a project folder that is built. It is silent because no file/project use them for their own instrumentation (as they are not explicitely included to the instrumentation)

An example of a file that causes problem is qtbase/src/corelib/arch/qatomic_windows.h. Indeed qatomic_windows should be instrumented as it has inline functions. We need a way to identify all those headers per folder and include them in a generic way.