Revert "ProjectExplorer: Upstream CMake's handling of outdated builds"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