deps: update libuv to 1.5.0

[saghul]

R=@bnoordhuis, @indutny

/cc @Fishrock123

[saghul]

CI: https://jenkins-iojs.nodesource.com/view/iojs/job/iojs+any-pr+multi/649/

[cjihrig]

For bookkeeping purposes, this should close #1397.

[Fishrock123]

#862 should also be closable by this.. still looking through the list for others.

[ChALkeR]

#1621

[Fishrock123]

#1512 also I think.

Those four issues seem to be the ones this fixes.

[bnoordhuis]

LGTM and the CI is happy. Landed in 04cc03b, thanks Saúl.

[rvagg]

I might need some help crafting a Notable Changes entry about this, I wasn't aware that we had so much resting on this, can someone in here take a stab at a summary of what this buys us? Also, great work @saghul, @bnoordhuis and other libuv folk!

[bnoordhuis]

@rvagg

• spawn's stdio can result in stderr being closed in child #862 is a fix for sometimes spawning child processes with invalid stdio file descriptors
• fs.accessSync() with W_OK throws EPERM for directories in Windows #1397 is a fix for an EPERM error with fs.access(W_OK) on Windows
• Borked libuv 1.4.2 update #1621 is a fix for an obscure build error that some people hit

Maybe @indutny can comment on #1512. I kind of zoned out after the first few messages.