Build with NO_X11=1 is not fully honored in drawbgfx.cpp

[wakass]

Thought this bug as reported on mametesters deserved some attention.

When building with the option NO_X11=1, a component of BGFX is not fully processing the directive in the file ./src/osd/modules/render/drawbgfx.cpp
At line #172, 195 and 196 there are hard references to X11.

I personally workaround this by replacing:

• Line Fixed N64 Mouse wrapping. #172 with: return nullptr;
• Line Added 1998 copyright Fantasia 2 version, single ROM difference #195-196 with:
  pd.ndt = NULL;
  pd.nwh = _window;

It seems that a check for SDL2 Video Ouput is missing for the Raspberry Pi using KMS/DRM video output (without X11).

[cuavas]

It doesn't need a duplicate report - all that will do is potentially split discussion.

[wakass]

Sorry, was not aware mametesters was part of global mame bugtracking.