Move the rest of this into files in ephemeral. See

[todo]

portfolio/linux/flutter/CMakeLists.txt

Lines 8 to 13 in a640132

	# TODO: Move the rest of this into files in ephemeral. See
	# https://github.com/flutter/flutter/issues/57146.
	# Serves the same purpose as list(TRANSFORM ... PREPEND ...),
	# which isn't available in 3.10.
	function(list_prepend LIST_NAME PREFIX)

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This issue was generated by todo based on a TODO comment in a640132. It's been assigned to @shashiben because they committed the code.