libvmmapi: Move some ioctl wrappers to vmmapi_machdep.c

[markj]

Summary

ioctls relating to segments and various x86-specific interrupt
controllers are easy candidates to move to vmmapi_machdep.c.

In vmmapi.h I'm just ifdefing MD prototypes for now. We could instead
split vmmapi.h into multiple headers, e.g., vmmapi.h and
vmmapi_machdep.h, but it's not obvious to me yet that that's the right
approach.

No functional change intended.

[jhb]

I think #ifdef's is fine for now. It might be nice to reorder the declaration to place all the MD prototypes in one #ifdef block.

[jhb]

In D40999#933353, @jhb wrote:

I think #ifdef's is fine for now. It might be nice to reorder the declaration to place all the MD prototypes in one #ifdef block.

I see you #ifdef more in followups, so maybe a cleanup commit at the end of the series to shuffle down into a single #ifdef block?

[markj]

In D40999#933366, @jhb wrote:

In D40999#933353, @jhb wrote:

I think #ifdef's is fine for now. It might be nice to reorder the declaration to place all the MD prototypes in one #ifdef block.

I see you #ifdef more in followups, so maybe a cleanup commit at the end of the series to shuffle down into a single #ifdef block?

Yeah, good idea. I'll do that once things are close to being finalized.