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

include/wx/msw/dib.h

@@ -70,12 +70,10 @@ public:
     // operations
     // ----------
 
-#ifndef __WXWINCE__
     // create a bitmap compatible with the given HDC (or screen by default) and
     // return its handle, the caller is responsible for freeing it (using
     // DeleteObject())
     HBITMAP CreateDDB(HDC hdc = 0) const;
-#endif // !__WXWINCE__
 
     // get the handle from the DIB and reset it, i.e. this object won't destroy
     // the DIB after this (but the caller should do it)
@@ -119,7 +117,6 @@ public:
     // these functions are only used by wxWidgets internally right now, please
     // don't use them directly if possible as they're subject to change
 
-#ifndef __WXWINCE__
     // creates a DDB compatible with the given (or screen) DC from either
     // a plain DIB or a DIB section (in which case the last parameter must be
     // non NULL)
@@ -137,7 +134,6 @@ public:
     // function (this overload is needed for wxBitmapDataObject code in
     // src/msw/ole/dataobj.cpp)
     static size_t ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp);
-#endif // __WXWINCE__
 
 
     // wxImage conversion