buildroot

tslib: use main project page in Config.in help text

Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
[Thomas: instead of adding tslib.org, just replace the github address by
the tslib.org one, which is the really upstream homepage.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>