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

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

PR: 214744
Reviewed by: rakuco, mat
Approved by: mat (mentor), rakuco (mentor)
Exp-run by: antoine
Differential Revision: https://reviews.freebsd.org/D8602