tests/spec: allow for a longer timeout of the spec suite for dist build
During our ninja dist builds on the CI we run into timeouts for the spec
test suite taking longer than the default 30s. We can't pass any
multiplier into the ninja dist command as we are doing on the other unit
test runs.
Allow th default value for this suite to also cover the CI case. It does
no harm on sutuations where it finishes faster.
Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Differential Revision: https://phab.enlightenment.org/D10593