BUG/BUILD: revert accidental change in the makefile from latest SSL fix

Commit 0bed994 ("BUG/MINOR: ssl: correctly initialize ssl ctx for
invalid certificates") accidently left a change in the Makefile
resulting in -ldl being appended to the LDFLAGS. As reported by
Dmitry Sivachenko, this will break build on systems without libdl
such as FreeBSD.

This fix must be backported to 1.5.
1 file changed