Qnx: Remove run-time dependency on QmakeProjectManager

This re-uses what work in RemoteLinux. There's still a compile-time header
dependency due to the QmakeProjectManager::Constants::KIT_INFORMATION_ID
constant.

Change-Id: I6d6b8bbaed8ec2e80d54afe62a5a6b7f84eb37ec
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/qmakeprojectmanager/qmakeprojectmanagerconstants.h

@@ -67,5 +67,8 @@ const char QMAKE_BC_ID[] = "Qt4ProjectManager.Qt4BuildConfiguration";
 // ICONS
 const char ICON_QTQUICK_APP[] = ":/wizards/images/qtquickapp.png";
 
+// Kit
+const char KIT_INFORMATION_ID[] = "QtPM4.mkSpecInformation";
+
 } // namespace Constants
 } // namespace QmakeProjectManager