pidof: reimplemented from scratch (replacing sysvinit pidof)
As the sysvinit becomes obsolete, some of the bundled tools need to find a new home. The procps-ng project seems to be the most suitable project for adopting the pidof tool. This commit introduces a redesigned version of pidof that satisfies the LSB requirements. In corner cases the behaviour might differ from the former one as the new version doesn't use any stat(2) calls.
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