loader: rename gfx_interp_md to gfx_interp_ref

We have the call to gfx_interp_ref to bring in the .o so that we get the
linker set item to add the language bindings at the right time. Where we
call

loader: rename gfx_interp_md to gfx_interp_ref

We have the call to gfx_interp_ref to bring in the .o so that we get the
linker set item to add the language bindings at the right time. Where we
call it is not the right time... So the _ref name is better. Change it
before we have too many others like it.

Sponsored by: Netflix

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loader: Move to using linker sets to bring in optional bits

The graphics stuff is optional. When it is pulled into the system, we
use a linker set to initialize the lua bindings for it now.

Sponsor

loader: Move to using linker sets to bring in optional bits

The graphics stuff is optional. When it is pulled into the system, we
use a linker set to initialize the lua bindings for it now.

Sponsored by: Netflix
Reviewed by: kevans, jhb
Differential Revision: https://reviews.freebsd.org/D43906

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loader: Add prototype for gfx_interp_md

This function will be used to draw in the graphics bindings when the
loader is compiled with graphics (gfx) support. Provide definitions
for lua and the simpl

loader: Add prototype for gfx_interp_md

This function will be used to draw in the graphics bindings when the
loader is compiled with graphics (gfx) support. Provide definitions
for lua and the simple interpreter. 4th support is forthcoming.

Sponsored by: Netflix
Reviewed by: kevans, jhb
Differential Revision: https://reviews.freebsd.org/D43903

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loader: Separate gfx to a new file.

Move gfx lua hook registration to a new file.

Sponsored by: Netflix
Reviewed by: kevans, jhb
Differential Revision: https://reviews.freebsd.org/D43901