child_process: deliver ENOENT on nextTick
child_process: deliver ENOENT on nextTick

After the uv upgrade, uv_spawn will now fail faster for certain
failures like ENOENT. However, our tests and other people may be
depending on that error being passed to the callback instead of a
throw.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node