This never worked with node >0.x because of faulty logic determining
`nodeSpawnSupportsStdio` -- attempting to compare with, e.g.,
`Number('v1')`.
Fixes#370
The test suite for this is a bit finnicky because root rights are
required to run dtrace. By default we run the dtrace.test.js file
with 'sudo'. Use this to skip the dtrace tests:
SKIP_DTRACE=1 make test
Note taht 'make test09' is busted because dtrace-provider seems
busted with node 0.9.1 at least.