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Fix build of audio/kwave on -CURRENT (or with clang 9 in general).

Description

Fix build of audio/kwave on -CURRENT (or with clang 9 in general).

There's a long description in the patch just added, but the error
looks something like this:

/tmp/v.cpp:1:27: note: constrained by private inheritance here
class foo {}; class bar : private foo {}; class baz : public bar { publi...

No PORTREVISION because it's no change for everyone except clang 9
users, who couldn't compile it previously.

Reported by: fallout

Details