CMake: Add heuristics to set "Run in Terminal" flag

For CMake file-api, flag all applications not linking to "QtXGui"
as "Run in Terminal".

Task-number: QTCREATORBUG-21451
Change-Id: I29f086c546d3d8a9f56257e423602f787db42ccd
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildtarget.h

@@ -53,6 +53,7 @@ public:
     QString title;
     Utils::FilePath executable; // TODO: rename to output?
     TargetType targetType = UtilityType;
+    bool linksToQtGui = false;
     Utils::FilePath workingDirectory;
     Utils::FilePath sourceDirectory;
     Utils::FilePath makeCommand;