ProjectExplorer: De-virtualize knowsAllBuildExectuables method on Project

Just use a setter instead.

Change-Id: Id5dff64e9a7fcdf64a245b71432318299a49d9f7
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -111,6 +111,7 @@ CMakeProject::CMakeProject(const FilePath &fileName)
     setProjectLanguages(Core::Context(ProjectExplorer::Constants::CXX_LANGUAGE_ID));
     setDisplayName(projectDirectory().fileName());
     setCanBuildProducts();
+    setKnowsAllBuildExecutables(false);
 
     // Timer:
     m_delayedParsingTimer.setSingleShot(true);
@@ -294,11 +295,6 @@ void CMakeProject::updateQmlJSCodeModel(CMakeBuildConfiguration *bc)
     modelManager->updateProjectInfo(projectInfo, this);
 }
 
-bool CMakeProject::knowsAllBuildExecutables() const
-{
-    return false;
-}
-
 Tasks CMakeProject::projectIssues(const Kit *k) const
 {
     Tasks result = Project::projectIssues(k);