Fix(mobx): Safer method to consume Iterator.prototype (#3943)

* Fix browser incompatability issue introduced in mobx 6.13.4

* No need for bracket notiation

* Proper fallback

Author: tonyraoul

.changeset/five-news-hammer.md

@@ -0,0 +1,5 @@
+---
+"mobx": patch
+---
+
+Fix browser compatability issue introduced in 6.13.4 release

packages/mobx/src/utils/iterable.ts

@@ -1,5 +1,15 @@
+import { getGlobal } from "../internal"
+
+// safely get iterator prototype if available
+const maybeIteratorPrototype = getGlobal().Iterator?.prototype || {}
+
 export function makeIterable<T, TReturn = unknown>(
     iterator: Iterator<T>
 ): IteratorObject<T, TReturn> {
-    return Object.assign(Object.create(Iterator.prototype), iterator)
+    iterator[Symbol.iterator] = getSelf
+    return Object.assign(Object.create(maybeIteratorPrototype), iterator)
+}
+
+function getSelf() {
+    return this
 }