Fix "make checkdpadd" in usr.bin/iscsictl by removing -lfl dependency

Approved by: rpaulo (mentor)
MFC after: 1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@270432 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Garbage collect libl dependency

The application links and runs without libl

Approved by: rpaulo (mentor)
Phabric: D673
X-MFC with: r270117
Submitted by: trociny


git-svn-id: svn+ssh://svn.freebsd.org/base/head@270433 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f