Being in the "machine/" directory already indicates these headers differHaving two distinct names for the interrupt headers serves to interfere
from machine to machinewith most efforts to converge the interrupt frameworks. As such the shorter Simply rename "intr.h" is
appropriateall of them to "machine/a_bikeshed_string_for_sed_to_target.h". This also matches the INTRNG machines for the header nameAnother name could be substituted,
but right now simply have a random one for this commit.