It appears that some distributions ship with a jackd reporting version 0.121.4, even though this was never formally released as a version according to the jackd website. Compiling FFADO trunk on these systems results in an 'incompatible libffado version' error, which suggests that this unofficial version of jackd includes support for FFADO API version 9. Change SConstruct on the assumption that this is true to allow others to test. If the testing shows this to be true this change will be left in.
git-svn-id: svn+ssh://ffado.org/ffado/trunk@2495 2be59082-3212-0410-8809-b0798e1608f0