CMake: Display all targets in project settings

All targets should be displayed, even without
binary artifacts, otherwise it's not possible
to select a CMake custom target to build.

Change-Id: I4b7640f460a248fd2d4b56428c2c8da3b13b9103
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Reviewed-by: Yuchen Deng <loaden@gmail.com>

src/plugins/cmakeprojectmanager/cmakeproject.h

@@ -88,7 +88,7 @@ public:
     ProjectExplorer::ProjectNode *rootProjectNode() const;
 
     QStringList files(FilesMode fileMode) const;
-    QStringList buildTargetTitles() const;
+    QStringList buildTargetTitles(bool runnable = false) const;
     QList<CMakeBuildTarget> buildTargets() const;
     bool hasBuildTarget(const QString &title) const;