Nothing in Xen respects --enable-sdl, and nothing in Xen links to libSDL,
so this PACKAGECONFIG is obsolete.
It looks like the last user of SDL in Xen was removed in "Remove
internal tools/ioemu tree"[1] back in 2008.
[1] xen 19dc3860dcfde9bc4ec4ef35bb1337e13276f630
Signed-off-by: Ross Burton <ross.burton@arm.com>
Reviewed-by: Christopher Clark <christopher.w.clark@gmail.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>