Revert "Add guard over wxMSWDateControls"

This reverts commit f1fa6d5ea2 which
doesn't seem correct nor necessary.

include/wx/msw/private/datecontrols.h

@@ -14,7 +14,6 @@
 
 #include "wx/msw/wrapwin.h"
 
-#if wxUSE_DATEPICKCTRL || wxUSE_CALENDARCTRL
 // namespace for the helper functions related to the date controls
 namespace wxMSWDateControls
 {
@@ -25,7 +24,6 @@ namespace wxMSWDateControls
 extern bool CheckInitialization();
 
 } // namespace wxMSWDateControls
-#endif // wxUSE_DATEPICKCTRL || wxUSE_CALENDARCTRL
 
 #endif // _MSW_PRIVATE_DATECONTROLS_H_
 

src/msw/datetimectrl.cpp

@@ -62,10 +62,8 @@ wxDateTimePickerCtrl::MSWCreateDateTimePicker(wxWindow *parent,
                                               const wxValidator& validator,
                                               const wxString& name)
 {
-#if wxUSE_DATEPICKCTRL || wxUSE_CALENDARCTRL
     if ( !wxMSWDateControls::CheckInitialization() )
         return false;
-#endif // wxUSE_DATEPICKCTRL || wxUSE_CALENDARCTRL
 
     // initialize the base class
     if ( !CreateControl(parent, id, pos, size, style, validator, name) )