From: Tim Schmielau <tim@physik3.uni-rostock.de>

This patch adds (or fixes) initialization of wall_to_monotonic for a few
more architectures.

This should get rid of the strange uptime>14600 days reports, except on arm
whose arch file layout is too unfamiliar to me.

The patch is blessed by George Anzinger, but untested due to lack of
hardware.