MFS r320566: MFC r320390:
With r318394 seems it breaks gpart(8) in some embedded systems such like PCEngines,
RPI1-B, Alix and APU2 boards as well as NanoBSD with the following message:

vnode_pager_generic_getpages_done: I/O read error 5

Seems the breakage was because it was missed to include acr in glabel update.

Approved by: re (delphij)