Teach CMake about Qt 5 plugins.

Change-Id: Idd3225759f9f5ec620f79e29035eb176f965bef7
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
Windows CE : Fix incorrect text rendering on wince with freetype engine

On wince with freetype engine can't render text for non-latin text.
because wince doesn't have truetype font FONTSIGNATURE api. so match
function in qwindowsfontdatabase_ft.cpp was always failed and render
incorrect text.
this patch has 3 changes.
1. extract font unicode signature using GetFontData function
2. append font fallback data from registry
   (see. http://msdn.microsoft.com/en-us/library/ms901076.aspx)
3. wince's default font path is windows. correct fontdir

Task-number: QTBUG-31974
Change-Id: If969df353492141669eeab33119f3506602871b3
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>