*/*: remove checks that base ld is(n't) GNU ld

GNU binutils was removed entierly prior to 13.0 so assume /usr/bin/ld
is LLD.

Sponsored by: DARPA, AFRL
Reviewed by: arrowd, bapt
Approved by: portmgr (bapt)
Differential Revision: https://reviews.freebsd.org/D55691