tests: avoid spurious failures with Solaris 9 cscope program * t/cscope.tap: Also check that the cscope program in use supports the '-q' option; if this is not the case, some cscope usages in the generated Makefiles would fail, so we must skip the checks involving those usages. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>