warning C4189 local variable initialized but not referenced

Change-Id: I7bea7063d924318eed07a2fad4ec88ea942302a0

slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionerImpl.cxx

@@ -442,10 +442,10 @@ void OGLTransitionerImpl::impl_prepareSlides()
     mbUseLeavingPixmap = false;
     mbUseEnteringPixmap = false;
 
-    GLWindow& rGLWindow(mpContext->getOpenGLWindow());
-
 #if defined( GLX_EXT_texture_from_pixmap )
 
+    GLWindow& rGLWindow(mpContext->getOpenGLWindow());
+
     if( mbTextureFromPixmap && xLeavingSet.is() && xEnteringSet.is() && mbHasTFPVisual ) {
         Sequence< Any > leaveArgs;
         Sequence< Any > enterArgs;
@@ -1245,9 +1245,9 @@ void OGLTransitionerImpl::disposeTextures()
 {
     mpContext->makeCurrent();
 
+#if defined( GLX_EXT_texture_from_pixmap )
     GLWindow& rGLWindow(mpContext->getOpenGLWindow());
 
-#if defined( GLX_EXT_texture_from_pixmap )
     PFNGLXRELEASETEXIMAGEEXTPROC myglXReleaseTexImageEXT = (PFNGLXRELEASETEXIMAGEEXTPROC) glXGetProcAddress( (const GLubyte*) "glXReleaseTexImageEXT" );
     if( mbUseLeavingPixmap ) {
         myglXReleaseTexImageEXT( rGLWindow.dpy, maLeavingPixmapGL, GLX_FRONT_LEFT_EXT );