Clean exported headers of the QtSupport plugin.

Change-Id: I6da98c3a9d5a89f80e721aed0e9fbf0f9ca6b43d
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>

src/plugins/qtsupport/debugginghelperbuildtask.cpp

@@ -32,6 +32,7 @@
 #include "qmldumptool.h"
 #include "baseqtversion.h"
 #include "qtversionmanager.h"
+#include <projectexplorer/toolchain.h>
 #include <utils/qtcassert.h>
 
 #include <QCoreApplication>

src/plugins/qtsupport/debugginghelperbuildtask.h

@@ -35,12 +35,13 @@
 #include <utils/environment.h>
 #include <utils/fileutils.h>
 #include <coreplugin/messagemanager.h>
-#include <projectexplorer/toolchain.h>
 
 #include <QObject>
 #include <QFutureInterface>
 #include <QMetaType>
 
+namespace ProjectExplorer { class ToolChain; }
+
 namespace QtSupport {
 
 class BaseQtVersion;

src/plugins/qtsupport/qtkitinformation.h

@@ -35,7 +35,6 @@
 
 #include "baseqtversion.h"
 
-#include <coreplugin/featureprovider.h>
 #include <projectexplorer/kitinformation.h>
 
 namespace Utils { class MacroExpander; }

src/plugins/qtsupport/qtoptionspage.cpp

@@ -42,6 +42,7 @@
 #include <coreplugin/progressmanager/progressmanager.h>
 #include <coreplugin/coreconstants.h>
 #include <coreplugin/variablechooser.h>
+#include <projectexplorer/toolchain.h>
 #include <projectexplorer/toolchainmanager.h>
 #include <projectexplorer/projectexplorerconstants.h>
 #include <utils/hostosinfo.h>