GPLv2 and GPLv3 both have an exception for proprietary "system libraries", which is designed to allow you to ship GPLed software that runs on proprietary systems. (You still have to meet the terms of the GPL in other regards, but you can ignore the system libraries.)

GPLv2 was stricter in that regard, in that the entity shipping the system libraries couldn't be the one shipping the GPLed software; GPLv3 drops that and allows anyone to ship GPLv3ed software for a proprietary platform, as long as you still meet the other requirements of the GPLv3.