packagegroup-self-hosted: remove libsdl

By default we now build our own libSDL, so don't ship libsdl in the self-hosted group.

(From OE-Core rev: 992c7023ad42e493f80d2ff4a035944f81140896)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/packagegroups/packagegroup-self-hosted.bb

@@ -188,8 +188,6 @@ RDEPENDS_packagegroup-self-hosted-graphics = "\
     libgl-dev \
     libglu \
     libglu-dev \
-    libsdl \
-    libsdl-dev \
     libx11-dev \
     adwaita-icon-theme \
     xdg-utils \