Fix print preview in 64 bit MinGW wxMSW builds.

Don't hardcode wrong PRINTDLG structure size for 64 bit builds.

In fact, don't hardcode it at all as it just doesn't seem to be necessary to
do it, the comment about Cygwin getting it wrong seems to be out of date.

Closes #16256.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76508 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/dcprint.cpp

@@ -251,16 +251,8 @@ static bool wxGetDefaultDeviceName(wxString& deviceName, wxString& portName)
     LPTSTR      lpszPortName;
 
     PRINTDLG    pd;
-
-    // Cygwin has trouble believing PRINTDLG is 66 bytes - thinks it is 68
-#ifdef __GNUWIN32__
-    memset(&pd, 0, 66);
-    pd.lStructSize    = 66; // sizeof(PRINTDLG);
-#else
     memset(&pd, 0, sizeof(PRINTDLG));
     pd.lStructSize    = sizeof(PRINTDLG);
-#endif
-
     pd.hwndOwner      = (HWND)NULL;
     pd.hDevMode       = NULL; // Will be created by PrintDlg
     pd.hDevNames      = NULL; // Ditto