Update spec for 1.9

I think that [1.9 branch](https://github.com/ariya/phantomjs/tree/1.9) is stable branch.
Also [Build Instructions](http://phantomjs.org/build.html) says that we should use [1.9 branch](https://github.com/ariya/phantomjs/tree/1.9).

``` sh
git checkout 1.9
```

But this branch couldn't build as a rpm package.

So I sent backport patch to fix #11262 on 1.9 branch.