Don't use _T() in public headers used under Unix.

Avoid conflict with the Sun CC standard headers (see #10660).

Also update the change log to mention _T() changes.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@61872 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/datectrl.h

@@ -19,7 +19,7 @@
 #include "wx/control.h"         // the base class
 #include "wx/datetime.h"
 
-#define wxDatePickerCtrlNameStr _T("datectrl")
+#define wxDatePickerCtrlNameStr wxT("datectrl")
 
 // wxDatePickerCtrl styles
 enum