Add the collation partition to the build

Includes a small linux-only bash script to generate locale partitions

tools/collate/README.md

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+This tool, which only works on Linux, uses your system's locale data to
+generate a collator partition for Tangara. This partition is uses to sort
+database information (album names, etc.) in a way that makes sense to humans.
+
+Because this script isn't portable, `Generic.LC_COLLATE` is included as a
+pregenerated collator partition that should work well for most people's
+music libraries.
+
+## Partition format
+
+The collator partition has 3MiB reserved for it in the partition table, which
+is enough to hold the compiled collation data for ISO14651 character sorting,
+plus a small amount of free space.
+
+The first 8 bytes of the partition are reserved for a partition name; usually
+the name of the locale that the collation data was compiled for, or 'Generic'
+for ISO14651 data.
+
+Following the 8 byte name, is a complete LC_COLLATE file, as generate by GNU
+libc's `localedef` utility. Debian's version 2.37 of this utility is known to
+work.
+
+FIXME: We should vendor this version of the tool, so that our format remains
+stable across glibc changes.

tools/collate/mkcollator.sh

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+#!/bin/bash
+set -eu
+
+if [ -z "${2:-}" ]; then
+  name="Generic"
+  locale="iso14651_t1"
+else
+  name="$1"
+  locale="$2"
+fi
+
+working_dir=$(mktemp -d)
+
+echo -n "$name" | dd iflag=fullblock bs=8 count=1 conv=sync of="$working_dir/name"
+localedef -f UTF-8 -i "$locale" --no-archive "$working_dir" || true
+cat "$working_dir/name" "$working_dir/LC_COLLATE" > "$name.LC_COLLATE"