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Avoid bsd.files.mk duplicate rule warning for bfd ldscripts

Description

Avoid bsd.files.mk duplicate rule warning for bfd ldscripts

Without this change I get lots of
warning: duplicate script for target "_FILESINS_ldscripts/elf64btsmip_fbsd.xw" ignored
message for every tree walk.

Reviewed By: imp, emaste
Differential Revision: https://reviews.freebsd.org/D18783

Details