[collectd] cpufreq for freebsd patch

[Marco van Tol]

Hi there,

This is my first time I do something like a pull request.

Please see attached patch that will allow FreeBSD systems to also enjoy the cpufreq plugin.

The github fork of my work can be found here:
https://github.com/ometol/collectd

Does this give you enough to consider a merge, or is there anything else I should provide?

Thank you very much in advance!

Marco van Tol

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