A couple of things that had previously been warnings are now errors,
so they need to be fixed up.

The first problem is a comparison between the address of a static
struct and NULL, which can never be valid.  A different fix for this
is upstream, which includes an API usage change; we don't need that to
fix this problem.

The second problem is a cast from pointer to integer in fbdevhw.c.
This also is fixed upstream by removing the whole section of code
which is bogus anyway, which is also done here.

This also adds a missing PR to the xserver-xorg recipe.

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>