Add a unit test for wxAffineMatrix2D class and its support in wxDC.

Verify that applying a world transformation to wxDC really does result in the
expected transformation.

See #13092.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67617 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/test_test_gui.dsp

@@ -239,6 +239,10 @@ SOURCE=.\menu\accelentry.cpp
 # End Source File
 # Begin Source File
 
+SOURCE=.\graphics\affinematrix.cpp
+# End Source File
+# Begin Source File
+
 SOURCE=.\asserthelper.cpp
 # End Source File
 # Begin Source File