Move build files into build-conf and rename to build-utils

Change-type: patch
Signed-off-by: Cameron Diver <cameron@balena.io>

build-utils/fix-jsonstream.js

@@ -0,0 +1,9 @@
+// JSONStream is a hybrid executable-library
+// and has a #! /usr/bin/env node at the beginning of the file.
+// This webpack loader removes it so that we have valid javascript for webpack to load.
+// Also, JSONStream starts a pipe between stdin and stdout if module.parent is undefined.
+// This pipe can fail throwing an uncaught exception, so we fake a module.parent to prevent this.
+// See https://github.com/dominictarr/JSONStream/issues/129
+module.exports = function(source) {
+	return 'module.parent = {};\n' + source.toString().replace(/^#! .*\n/, '');
+};