library: become more tolerant of /proc/cpuinfo formats

In the issue referenced below, it is now apparent that
not all architectures follow a logical/expected format
for the /proc/cpuinfo file. Specifically, the expected
empty line after each processor entry might be missing
under some architectures for the last processor shown.

[ and a belated review of kernel source confirms it. ]

So this commit makes our stat module a little bit more
tolerant of some potential missing newline characters.

[ along the way, it's also now tolerant of a missing ]
[ cpuinfo file plus more efficient whenever a cpu is ]
[ is not linked to a core or toggled offline/online. ]

Reference(s):
https://gitlab.com/procps-ng/procps/-/issues/272
procps-ng/procps#272

Signed-off-by: Jim Warner <james.warner@comcast.net>

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