Disable memory stream on ExtEventLoop with PHP7

Author: cboden

tests/ExtEventLoopTest.php

@@ -68,6 +68,10 @@ public function writeToStream($stream, $content)
      */
     public function testCanUseReadableStreamWithFeatureFds()
     {
+        if (PHP_VERSION_ID > 70000) {
+            $this->markTestSkipped('Memory stream not supported');
+        }
+
         $this->loop = $this->createLoop(true);
 
         $input = fopen('php://temp/maxmemory:0', 'r+');