test: check zlib version for createDeflateRaw

We are currenly builing Node with --shared-zlib which happens to be
version 1.2.8. The test for zlib.createDeflateRaw is expected to fail
but does not when using version 1.2.8.

As far as I can tell the fix referred to in the comments was
introduced in version 1.2.9:
- Reject a window size of 256 bytes if not using the zlib wrapper

This commit suggests adding a check for the version and skipping this
assert if the version is less than 1.2.9.

Refs: http://zlib.net/ChangeLog.txt
Backport-PR-URL: #15478
PR-URL: #13697
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

test/parallel/test-zlib-failed-init.js

@@ -1,10 +1,15 @@
 'use strict';
 
-require('../common');
+const common = require('../common');
 
 const assert = require('assert');
 const zlib = require('zlib');
 
+if (process.config.variables.node_shared_zlib &&
+    /^1\.2\.[0-8]$/.test(process.versions.zlib)) {
+  common.skip("older versions of shared zlib don't throw on create");
+}
+
 // For raw deflate encoding, requests for 256-byte windows are rejected as
 // invalid by zlib.
 // (http://zlib.net/manual.html#Advanced)