QmakeBuildConfiguration: Use delegating constructor

Change-Id: I27690c11ca89509dbf770beacf8b13349c0ab7da
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/qmakeprojectmanager/qmakebuildconfiguration.cpp

@@ -100,15 +100,9 @@ const char BUILD_CONFIGURATION_KEY[] = "Qt4ProjectManager.Qt4BuildConfiguration.
 
 enum { debug = 0 };
 
-QmakeBuildConfiguration::QmakeBuildConfiguration(Target *target) :
-    BuildConfiguration(target, Core::Id(QMAKE_BC_ID)),
-    m_shadowBuild(true),
-    m_isEnabled(false),
-    m_qmakeBuildConfiguration(0),
-    m_subNodeBuild(0),
-    m_fileNodeBuild(0)
+QmakeBuildConfiguration::QmakeBuildConfiguration(Target *target)
+    : QmakeBuildConfiguration(target, Core::Id(QMAKE_BC_ID))
 {
-    ctor();
 }
 
 QmakeBuildConfiguration::QmakeBuildConfiguration(Target *target, Core::Id id) :