Fixed linker errors on Windows.

src/Magnum/AbstractImage.cpp

@@ -146,8 +146,8 @@ template<UnsignedInt dimensions> std::size_t AbstractImage::dataSize(Math::Vecto
     return rowSize*size.product();
 }
 
-template std::size_t AbstractImage::dataSize<1>(Math::Vector<1, Int>) const;
-template std::size_t AbstractImage::dataSize<2>(Math::Vector<2, Int>) const;
-template std::size_t AbstractImage::dataSize<3>(Math::Vector<3, Int>) const;
+template MAGNUM_EXPORT std::size_t AbstractImage::dataSize<1>(Math::Vector<1, Int>) const;
+template MAGNUM_EXPORT std::size_t AbstractImage::dataSize<2>(Math::Vector<2, Int>) const;
+template MAGNUM_EXPORT std::size_t AbstractImage::dataSize<3>(Math::Vector<3, Int>) const;
 
 }

src/Magnum/SceneGraph/Drawable.h

@@ -280,6 +280,10 @@ typedef BasicDrawableGroup3D<Float> DrawableGroup3D;
 typedef DrawableGroup<3, Float> DrawableGroup3D;
 #endif
 
+#ifdef CORRADE_TARGET_WINDOWS
+extern template class MAGNUM_SCENEGRAPH_EXPORT Drawable<2, Float>;
+extern template class MAGNUM_SCENEGRAPH_EXPORT Drawable<3, Float>;
+#endif
 }}
 
 #endif