Revert "ProjectExplorer: Upstream CMake's handling of outdated builds"

This reverts commit 8536504caa.

Break CustomRunConfigurations.

Change-Id: I43020bd34780cb5fd02bbe640a817370d73cca18
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/cmakeprojectmanager/cmakerunconfiguration.cpp

@@ -76,6 +76,28 @@ void CMakeRunConfiguration::doAdditionalSetup(const RunConfigurationCreationInfo
     updateTargetInformation();
 }
 
+bool CMakeRunConfiguration::isBuildTargetValid() const
+{
+    return Utils::anyOf(target()->applicationTargets().list, [this](const BuildTargetInfo &bti) {
+        return bti.buildKey == buildKey();
+    });
+}
+
+void CMakeRunConfiguration::updateEnabledState()
+{
+    if (!isBuildTargetValid())
+        setEnabled(false);
+    else
+        RunConfiguration::updateEnabledState();
+}
+
+QString CMakeRunConfiguration::disabledReason() const
+{
+    if (!isBuildTargetValid())
+        return tr("The project no longer builds the target associated with this run configuration.");
+    return RunConfiguration::disabledReason();
+}
+
 void CMakeRunConfiguration::updateTargetInformation()
 {
     BuildTargetInfo bti = buildTargetInfo();

src/plugins/cmakeprojectmanager/cmakerunconfiguration.h

@@ -38,8 +38,13 @@ public:
     CMakeRunConfiguration(ProjectExplorer::Target *target, Core::Id id);
 
 private:
+    QString disabledReason() const override;
+
     void doAdditionalSetup(const ProjectExplorer::RunConfigurationCreationInfo &) override;
+    bool isBuildTargetValid() const;
     void updateTargetInformation();
+
+    void updateEnabledState() final;
 };
 
 class CMakeRunConfigurationFactory : public ProjectExplorer::RunConfigurationFactory