uv.h: add EPERM to errno map to fix regression
EPERM isn't mapped in so chown returns an unknown error. This is a
regression from 0.4.12.
philips:node/ (master*) $ cat chown.js
var fs = require('fs')
fs.chown("/tmp/foobar", 100, 100, function(er){ console.log(er);})
philips:node/ (master*) $ ls -la /tmp/foobar
total 0
drwxr-xr-x 2 root wheel 68 Jan 24 17:21 .
0.4
---
philips:node/ (master*) $ /usr/local/Cellar/node/0.4.12/bin/node chown.js
{ stack: [Getter/Setter],
arguments: undefined,
type: undefined,
message: 'EPERM, Operation not permitted \'/tmp/foobar\'',
errno: 1,
code: 'EPERM',
path: '/tmp/foobar' }
master
------
philips:node/ (master*) $ ./node chown.js
{ [Error: UNKNOWN, unknown error '/tmp/foobar'] errno: -1, code: 'UNKNOWN', path: '/tmp/foobar' }
AFTER
-----
philips:node/ (master*) $ ./node chown.js
{ [Error: EPERM, operation not permitted '/tmp/foobar'] errno: 49, code: 'EPERM', path: '/tmp/foobar' }
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