i2ctransfer: Don't link with libi2c

i2ctransfer doesn't make use of any function from libi2c so it should
not link with that library.

Fixes: 9fc53a7fc669 ("i2c-tools: add new tool 'i2ctransfer'")
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>