Change the empty CStruct classes to use CPointer
Change the empty CStruct classes to use CPointer

This fixes the

===SORRY!=== Error while compiling
/home/jonathan/devel/perl6/3rdparty-modules/Perl6-X11-Xlib-Raw/lib/X11/Xlib/Raw.pm6
(X11::Xlib::Raw)
Class X11::Xlib::Raw::GC has no attributes, which is illegal with the
CStruct representation.
at
/home/jonathan/devel/perl6/3rdparty-modules/Perl6-X11-Xlib-Raw/lib/X11/Xlib/Raw.pm6
(X11::Xlib::Raw):29

In the most recent rakudo (it will be fine with older versions too.)

slobo/Perl6-X11-Xlib-Raw