libftid: Change to use GPLv2 intead of GPLv2-RLE.

libftdi itself is licensed under LGPLv2, with some parts (eeprom programmer) is
licensed under GPLv2. There doesn't seem to be any part licensed under a
GPLv2-RLE variation of GPLv2, and so we should use GPLv2 instead of
GPLv2-RLE.

Signed-off-by: Martin Ertsaas <mertsas@cisco.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>