Optionaly disable buildsteps

Task-number: QTCREATORBUG-6713
Change-Id: Ief7f8509572cfa2008209083e5ae9c7763eba42a
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/cmakeprojectmanager/makestep.cpp

@@ -136,7 +136,6 @@ bool MakeStep::init()
     QString arguments = Utils::QtcProcess::joinArgs(m_buildTargets);
     Utils::QtcProcess::addArgs(&arguments, additionalArguments());
 
-    setEnabled(true);
     setIgnoreReturnValue(m_clean);
 
     ProcessParameters *pp = processParameters();