contextifySourceUrl = (context, source, associatedObjectForCache) => {
	if (source.startsWith("webpack://")) return source;
	return `webpack://${makePathsRelative(
		context,
		source,
		associatedObjectForCache
	)}`;
}
@param {string} context absolute context path
@param {string} source a source path
@param {AssociatedObjectForCache=} associatedObjectForCache an object to which the cache will be attached
@returns {string} new source path