ports-mgmt/pkg-*: fix symbol collisions

while we fixed the symbol collision between libmd and libcrypto long
ago in dynamic linked program, the collision is still there somehow for
statically build programs.

The manual check for liblzma_libs for static linking that was added long
ago brings in a link to libmd before a link to libcrypto (this is since
FreeBSD 13.0+

This manual check is not necessary anymore anyway, so let's drop it.

Reported by: Franco Fitchner (from Opnsense)