ProjectExplorer: De-virtualize some more virtual methods

Use setters/getters for the bool flags in
Project::needsBuildConfigurations() and
Project::hasMakeInstallEquivalent.

Change-Id: I5ce937c3a5e8e0db627cda02a9007f8c28ccda0c
Reviewed-by: hjk <hjk@qt.io>

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -112,6 +112,7 @@ CMakeProject::CMakeProject(const FilePath &fileName)
     setDisplayName(projectDirectory().fileName());
     setCanBuildProducts();
     setKnowsAllBuildExecutables(false);
+    setHasMakeInstallEquivalent(true);
 
     // Timer:
     m_delayedParsingTimer.setSingleShot(true);