/usr/bin/ld-musl-config is in musl 0.9.15-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#!/bin/sh grep -s -v '^#\|^$' /etc/ld-musl-x86_64.d/* | sort -u > /etc/ld-musl-x86_64.path