CMake: Make it easier to get the expanded value of a CMake configuration

Change-Id: If289c48ef4ec2815e8bd12e08b990d1dc809c524
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/plugins/cmakeprojectmanager/builddirmanager.cpp

@@ -81,7 +81,7 @@ static QStringList toArguments(const CMakeConfig &config, const ProjectExplorer:
                                      a.append(QLatin1String(":INTERNAL="));
                                      break;
                                  }
-                                 a.append(QString::fromUtf8(k->macroExpander()->expand(i.value)));
+                                 a.append(i.expandedValue(k));
 
                                  return a;
                              });