With the configuration for sdl and glx, the virtual/libx11 in DEPENDS
no longer makes any sense at all, the dependency comes through the
various graphics backends. Therefore drop it. The glx PACKAGECONFIG
is added for completeness. We avoid a floating dependency on mesa.
(From OE-Core rev: ddb88df0eca85b0b2afca68a23c018d39a4c3d78)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>