Fix positioning project

Remove a non-existing header, and add the we mean it disclaimer on a
private header missing it.

Change-Id: I47847f0cf86693298fc1e778979ecfa3d1f9cc34
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

src/positioning/positioning.pro

@@ -58,7 +58,6 @@ PRIVATE_HEADERS += \
                     qlocationdata_simulator_p.h \
                     qdoublematrix4x4_p.h \
                     qgeopath_p.h \
-                    qgeopolygon_p.h \
                     qgeocoordinateobject_p.h \
                     qclipperutils_p.h
 

src/positioning/qgeocoordinateobject_p.h

@@ -40,6 +40,17 @@
 #ifndef QGEOCOORDINATEOBJECT_P_H
 #define QGEOCOORDINATEOBJECT_P_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include <QtPositioning/private/qpositioningglobal_p.h>
 #include <QObject>
 #include <QGeoCoordinate>