sqlcipher: specify tclConfig.sh directory

Otherwise it will search around, and if the host has it then it breaks.
Fixes:
http://autobuild.buildroot.net/results/057/0572a9a1f69ee214efb10863f5d2852b25bf4f54/



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