Thanks for the patch, however another one to fix compilation of Cycles standalone due to API breakage is already in code review (D9961), which will be dealt with promptly. I will add you subscriber there, so you get notified when it is merged.

For future reference, about your uncertainty:

cam->need_update = true can be replaced with cam->tag_modified() if the intent is to force an update. With the new socket API, Cycles will automatically detect changes, and manually tagging for an update is not needed anymore in most cases.

cam->width is now for internal use, so Camera.get_full_width or BufferParams.width can be used instead.