Remove Windows CE support

Windows CE doesn't seem to be supported by Microsoft any longer. Last CE
release was in early 2013 and the PocketPC and Smartphone targets supported by
wxWidgets are long gone.

The build files where already removed in an earlier cleanup this commit
removes all files, every #ifdef and all documentation regarding the Windows CE
support.

Closes https://github.com/wxWidgets/wxWidgets/pull/81

src/msw/combobox.cpp

@@ -310,11 +310,9 @@ bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
             break;
 
         case CBN_SELENDOK:
-#ifndef __SMARTPHONE__
             // we need to reset this to prevent the selection from being undone
             // by wxChoice, see wxChoice::MSWCommand() and comments there
             m_lastAcceptedSelection = wxID_NONE;
-#endif
 
             // set these variables so that they could be also fixed in
             // CBN_EDITCHANGE below
@@ -500,10 +498,8 @@ WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 
     if ( style & wxCB_READONLY )
         msStyle |= CBS_DROPDOWNLIST;
-#ifndef __WXWINCE__
     else if ( style & wxCB_SIMPLE )
         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
-#endif
     else
         msStyle |= CBS_DROPDOWN;
 
@@ -705,7 +701,6 @@ wxWindow *wxComboBox::MSWFindItem(long id, WXHWND hWnd) const
 
 void wxComboBox::SetLayoutDirection(wxLayoutDirection dir)
 {
-#ifndef __WXWINCE__
     // Edit field and drop-down list must be handled explicitly.
 
     // Edit field is a special EDIT control (e.g. it always returns null
@@ -735,7 +730,6 @@ void wxComboBox::SetLayoutDirection(wxLayoutDirection dir)
     {
         wxUpdateLayoutDirection(info.hwndList, dir);
     }
-#endif // !__WXWINCE__
 
     wxChoice::SetLayoutDirection(dir);
 }