buildroot

thrift: disable tutorial(s)

The tutorials don't pass pedantic mode hence causing failures.
And we don't care about tutorials anyway, disable them to save time as
well. Fixes.
http://autobuild.buildroot.net/results/f68/f68d537e623f565000ca966372a7c0277f4e3888/

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>