cmake: Show errors for unsupported CMake versions

Show an error icon in the CMake settings, and instead running CMake with
unsupported parameters show an error in the Issues pane.

Arguably it should not be possible to select an unsupported CMake
version in the kit settings at all (neither manually nor automatically
when setting up kits), but this is the less intrusive change for now.

Fixes: QTCREATORBUG-24553
Change-Id: I32caa2ce93d28cbd9db90e2004d60da93d32c68c
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cmakeprojectmanager/cmakesettingspage.cpp

@@ -204,7 +204,8 @@ public:
             if (column != 0)
                 return QVariant();
 
-            const bool hasError = !m_pathExists || !m_pathIsFile || !m_pathIsExecutable;
+            const bool hasError = !m_isSupported || !m_pathExists || !m_pathIsFile
+                                  || !m_pathIsExecutable;
             if (hasError)
                 return Utils::Icons::CRITICAL.icon();
             return QVariant();