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/listbox.cpp

@@ -177,7 +177,7 @@ WXDWORD wxListBox::MSWGetStyle(long style, WXDWORD *exstyle) const
     if ( m_windowStyle & wxLB_SORT )
         msStyle |= LBS_SORT;
 
-#if wxUSE_OWNER_DRAWN && !defined(__WXWINCE__)
+#if wxUSE_OWNER_DRAWN
     if ( m_windowStyle & wxLB_OWNERDRAW )
     {
         // we don't support LBS_OWNERDRAWVARIABLE yet and we also always put
@@ -742,11 +742,7 @@ bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 
     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 
-#ifdef __WXWINCE__
-    HDC hdc = GetDC(NULL);
-#else
     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
-#endif
 
     {
         wxDCTemp dc((WXHDC)hdc);
@@ -756,11 +752,7 @@ bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
         pStruct->itemWidth  = dc.GetCharWidth();
     }
 
-#ifdef __WXWINCE__
-    ReleaseDC(NULL, hdc);
-#else
     DeleteDC(hdc);
-#endif
 
     return true;
 }