Update the dependency code in bsd.qt.mk to the one from kde.mk

[tcberner]

Summary

The dependency code from kde.mk can add LIB_DEPENDS if the sense-file is a
library. Import this into bsd.qt.mk

This is done to simplify D8540

[rakuco]

looks good to me. @mat?

[tcberner]

Fixup phonon paths.

[mat]

I have not looked at it in details, but it looks like the right thing to do.

Note that LIB_DEPENDS use ldconfig's data (not ldconfig directly), so, if the library is not in LOCALBASE/lib, the full path to it must be set via USE_LDCONFIG's mechanism in the port providing the library.

[tcberner]

They all should already have USE_LDCONFIG=${PREFIX}/${QT_LIBDIR_REL} in their Makefiles [and so far at least I have had no fallout while testbuilding this diff].

[tcberner]

Remove the qmake_TYPE=build line that slipped in from qt.mk.

[tcberner]

Exp-Run looked fine.

[mat]