kondo doesn't build on FreeBSD

[yurivict]

... because many sections in the code are conditioned on target_os = "linux".

Conditions should include target_os = "freebsd".

[tbillington]

@yurivict would you be able to put the compiler output here? I don't have a freebsd system.

Kondo itself doesn't have any target specific code so it will be coming from one of the dependencies.