Well from what I gather, yes it does ship with GD. In fact from what I gather from forums its best to activate the shipped library rather than install another copy of it.
I had a look on the link you posted, and the only mention of GD is here:
The module includes many popular PHP extensions, among them:
the MySQL and PostgreSQL databases
the cURL library for various communications protocols
the GD image creation library (with PNG, JPEG, PostScript Type 1 and TrueType font options).
the expat XML parser and WDDX support
the IMAP client library
mcrypt encryption functions
Hmm, well, I'll keep digging. I'm sure something will come up.