Fix ODR Violations under LTO

/home/peter/libreoffice/sd/source/ui/slideshow/slideshowimpl.hxx:162:7: warning: type ‘struct SlideshowImpl’ violates one definition rule [-Wodr]
 class SlideshowImpl : private ::cppu::BaseMutex, public SlideshowImplBase
       ^
/home/peter/libreoffice/sd/source/ui/slideshow/slideshowimpl.hxx:162:7: note: a different type is defined in another translation unit
 class SlideshowImpl : private ::cppu::BaseMutex, public SlideshowImplBase
       ^
/home/peter/libreoffice/sd/source/ui/slideshow/slideshowimpl.hxx:334:28: note: the first difference of corresponding definitions is field ‘mpShowWindow’
     VclPtr<ShowWindow>     mpShowWindow;
                            ^
/home/peter/libreoffice/sd/source/ui/slideshow/slideshowimpl.hxx:334:28: note: a field of same name but different type is defined in another translation unit
     VclPtr<ShowWindow>     mpShowWindow;
                            ^
/home/peter/libreoffice/include/vcl/vclptr.hxx:75:7: note: type name ‘VclPtr<sd::ShowWindow>’ should match type name ‘VclPtr<ShowWindow>’
 class VclPtr
       ^
/home/peter/libreoffice/include/vcl/vclptr.hxx:75:7: note: the incompatible type is defined here
 class VclPtr
       ^
/home/peter/libreoffice/sd/source/ui/slideshow/slideshowviewimpl.hxx:166:7: warning: type ‘struct SlideShowView’ violates one definition rule [-Wodr]
 class SlideShowView : public ::comphelper::OBaseMutex,
       ^
/home/peter/libreoffice/sd/source/ui/slideshow/slideshowviewimpl.hxx:166:7: note: a different type is defined in another translation unit
 class SlideShowView : public ::comphelper::OBaseMutex,
       ^
/home/peter/libreoffice/sd/source/ui/slideshow/slideshowviewimpl.hxx:232:45: note: the first difference of corresponding definitions is field ‘mpSlideShow’
     SlideshowImpl*                          mpSlideShow;
                                             ^
/home/peter/libreoffice/sd/source/ui/slideshow/slideshowviewimpl.hxx:232:45: note: a field of same name but different type is defined in another translation unit
     SlideshowImpl*                          mpSlideShow;
                                             ^
/home/peter/libreoffice/sd/source/ui/slideshow/slideshowimpl.hxx:162:7: note: type ‘struct SlideshowImpl’ should match type ‘struct SlideshowImpl’ that itself violate one definition rule
 class SlideshowImpl : private ::cppu::BaseMutex, public SlideshowImplBase
       ^
/home/peter/libreoffice/sd/source/ui/slideshow/slideshowimpl.hxx:162:7: note: the incompatible type is defined here
 class SlideshowImpl : private ::cppu::BaseMutex, public SlideshowImplBase
       ^

Change-Id: Ibbb7fb6f35f7e2771aef78a38fc4b6adef131845
Reviewed-on: https://gerrit.libreoffice.org/21503Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>
Tested-by: jan iversen <jani@documentfoundation.org>

sd/source/ui/slideshow/slideshowimpl.hxx

@@ -80,13 +80,13 @@
 
 class SfxViewFrame;
 class SfxRequest;
-class ShowWindow;
 
 namespace sd
 {
 class SlideShowView;
 class AnimationSlideController;
 class PaneHider;
+class ShowWindow;
 
 struct PresentationSettingsEx : public PresentationSettings
 {
@@ -331,7 +331,7 @@ private:
     SdDrawDocument* mpDoc;
 
     VclPtr<vcl::Window>    mpParentWindow;
-    VclPtr<ShowWindow>     mpShowWindow;
+    VclPtr<sd::ShowWindow>     mpShowWindow;
     VclPtr<PushButton>     mpTimeButton;
 
     std::shared_ptr< AnimationSlideController > mpSlideController;