Incorrect license detection in config.guess

[pombredanne]

These are two variants of the config.guess notice:
https://git.savannah.gnu.org/cgit/config.git/plain/config.guess?id=93b5037172b15ad28952481933517f1ba93d125b

https://git.savannah.gnu.org/cgit/config.git/plain/config.guess?id=636f39d3a3836e88bfc2ddc39ee47d1c499e0c6e

The first is GPL-2+ with a simple autoconf exception and is incorrectly reported as GPL 3.0 with exception
The second is GPL-3+ with a variant autoconf exception

[pombredanne]

This has been merged in develop