gyp: specialize node.d for freebsd

`node.d` should use `psinfo.d` instead of `procfs.d` and have statically
defined architecture on FreeBSD.
configure: allow --with-dtrace on freebsd
dtrace: workaround linker bug on FreeBSD
installer: copy `node.d` only with node_use_dtrace
Merge remote-tracking branch 'upstream/v0.10' into v0.10