x/crypto/ssh/terminal: file descriptor type is inconvenient

by **jeff.allen**:

<pre>What steps will reproduce the problem?
1. write terminal.MakeRaw(os.Stdout.Fd())
2. notice it doesn't compile
3. write terminal.MakeRaw(int(os.Stdout.Fd()))

What is the expected output?

It would be nicer if MakeRaw agreed with Fd() that the type of a file descriptor is
uintptr.

Which revision are you using?  (hg identify)

bce220d03774 weekly/weekly.2012-03-22</pre>
