added #include <wx/dc.h> after reading http://code.google.com/p/heekscad/issues/detail?id=153
added #include <wx/dc.h> after reading http://code.google.com/p/heekscad/issues/detail?id=153
danheeks/heekscad,danheeks/heekscad,danheeks/heekscad,danheeks/heekscad