Sadly in 2.5 there is no such library, so here you can find a Joomla ready-to-install archive.
It's a useful resource for developers: they can install this library when they install their extensions, then it could be updated using Joomla! update stream.
This is a "lite" version, with most used fonts only. If you need more, you can consider downloading the main package from the official site.
*** UPDATE ***
We have uploaded a sample installation script, showing how you can install this library together with your compoent