fix arraybuffer polyfill to not error in ie8

polyfills/ArrayBuffer/config.toml

@@ -35,3 +35,4 @@ samsung_mob = "<2"
 [install]
 module = "js-polyfills"
 paths = [ "typedarray.js" ]
+postinstall = "update.task.js"

polyfills/ArrayBuffer/patch.jsdiff

@@ -0,0 +1,25 @@
+diff --git a/polyfills/ArrayBuffer/polyfill.js b/polyfills/ArrayBuffer/polyfill.js
+index a4295ebf..4d6f1441 100644
+--- a/polyfills/ArrayBuffer/polyfill.js
++++ b/polyfills/ArrayBuffer/polyfill.js
+@@ -117,12 +117,14 @@
+     if (obj.length > MAX_ARRAY_LENGTH) throw RangeError('Array too large for polyfill');
+
+     function makeArrayAccessor(index) {
+-      Object.defineProperty(obj, index, {
+-        'get': function() { return obj._getter(index); },
+-        'set': function(v) { obj._setter(index, v); },
+-        enumerable: true,
+-        configurable: false
+-      });
++      try {
++        Object.defineProperty(obj, index, {
++          'get': function() { return obj._getter(index); },
++          'set': function(v) { obj._setter(index, v); },
++          enumerable: true,
++          configurable: false
++        });
++      } catch (_){ }
+     }
+
+     var i;

polyfills/ArrayBuffer/update.task.js

@@ -0,0 +1,15 @@
+/* eslint-env node */
+'use strict';
+
+var fs = require('graceful-fs');
+var diff = require('diff');
+var process = require('process');
+var path = require('path');
+
+var polyfill = fs.readFileSync(path.join(__dirname, './polyfill.js'), 'utf8');
+var patch = fs.readFileSync(path.join(__dirname, './patch.jsdiff'), 'utf8');
+
+var patched = diff.applyPatch(polyfill, patch);
+
+if (patched === false) {process.exit(1);}
+fs.writeFileSync(path.join(__dirname, './polyfill.js'), patched);