* Create a wavpack_bin sub-package to make the base package depend
on no other package.
* Move wavpack(1), wvgain(1), wvunpack(1) and wvtag(1) (as well as
the dependency on lib:libiconv) to the wavpack_bin sub-package.
* While at it, define commandSuffix to be more consistent with
other packages which already define it.
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