/usr/lib/ldscripts/avrxmega3.xn is in binutils-avr 2.20.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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OUTPUT_FORMAT("elf32-avr","elf32-avr","elf32-avr")
OUTPUT_ARCH(avr:103)
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