Update phantomjs to 1.9.1.

The main change from the old 1.4.1 version is that PhantomJS now integrates
a QT4 fork and runs entirely headless.

For other changes, see release notes:

http://phantomjs.org/releases.html

Tested on SmartOS/i386 and NetBSD 6.1/x86_64, 64bit build on SunOS remains
broken for now.