ProjectExplorer: Move makeInstallCommand()

... from Project to BuildSystem.

More direct and less use of Target::activeBuildConfiguration().

Change-Id: I148381d23be0f9ab0750ed1440e1b2b3e25aded0
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildsystem.h

@@ -98,6 +98,9 @@ public:
     Utils::CommandLine commandLineForTests(const QList<QString> &tests,
                                            const QStringList &options) const final;
 
+    ProjectExplorer::MakeInstallCommand makeInstallCommand(
+            const Utils::FilePath &installRoot) const final;
+
     static bool filteredOutTarget(const CMakeBuildTarget &target);
 
     bool isMultiConfig() const;