Cmake: Fix compile output glitch

Using a dedicated OutputLineParser ensures that we only ever see
complete lines and thus prevents "partially red" lines in the compile
output pane.

Fixes: QTCREATORBUG-24209
Change-Id: I12b3de70b81789afe727b66e366facdcc81f8ab8
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildstep.h

@@ -73,14 +73,10 @@ signals:
     void buildTargetsChanged();
 
 protected:
-    void processStarted() override;
     void processFinished(int exitCode, QProcess::ExitStatus status) override;
 
     bool fromMap(const QVariantMap &map) override;
 
-    // For parsing [ 76%]
-    void stdOutput(const QString &output) override;
-
 private:
     void ctor(ProjectExplorer::BuildStepList *bsl);
 
@@ -98,13 +94,10 @@ private:
 
     QMetaObject::Connection m_runTrigger;
 
-    QRegExp m_percentProgress;
-    QRegExp m_ninjaProgress;
     QString m_ninjaProgressString;
     QStringList m_buildTargets;
     QString m_cmakeArguments;
     QString m_toolArguments;
-    bool m_useNinja = false;
     bool m_waiting = false;
 };