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Mk/bsd.port.mk: use GNU LD from ports on powerpc64 elfv2 when GNU LD is required

Description

Mk/bsd.port.mk: use GNU LD from ports on powerpc64 elfv2 when GNU LD is required

The reason is that on elfv2 systems we still have ld.bfd in base, but it's only used for 32-bit binaries (LLD currently doesn't support linking 32-bit PPC binaries).
ld.bfd from base supports only elfv1 and using it breaks linking many ports that set LLD_UNSAFE. Use Binutils from ports in such case.

PR: 239743
Submitted by: jbeich
Approved by: portmgr
Differential Revision: https://reviews.freebsd.org/D21996