Fix BuildTestSuiteDetailedV09 on GHC <7.6

This commit fixes the new test case so that it is always built with the in-place version of Cabal. The problem was that the test package itself depends on Cabal, so build would fail with a sufficiently old version of Cabal installed. No other package tests currently do this, but I tried to make it easy to extend this behavior in case another package test needs to in the future.