[Bug 40254] mshtml:script test regression (timeout)

https://bugs.winehq.org/show_bug.cgi?id=40254

--- Comment #4 from Nikolay Sivov  ---
Maybe including winetest.js helped somehow. I noticed that when you run into
undefined objects/functions test simply goes idle and never returns, and
win_skip() was used before my change but was undefined, that could explain that
this line is printed now:

---
script.c:719: Tests skipped: L"postMessage not available"
---