Use flock-style lock on Windows to limit number of concurrent links

Use flock-style lock on Windows to limit number of concurrent links

This is mostly for goma builds.
Committed: https://code.google.com/p/gyp/source/detail?r=1464

[scottmg, 2012-08-09 16:21:12]

(Tested on cygwin now, seems OK)

Someone might want to change to the more fancy 2+ version __LIMITER.exe thingy
later, but this simple one works for now.

[Nico, 2012-08-09 17:22:36]

stampy lgtm

You said you wanted to check that this doesn't affect regular build times. I
assume you did that.

[scottmg, 2012-08-09 17:56:42]

On 2012/08/09 17:22:36, Nico wrote:
> stampy lgtm
> 
> You said you wanted to check that this doesn't affect regular build times. I
> assume you did that.

Yeah, I didn't notice any difference larger (larger than the noise anyway).

[iannucci, 2012-08-09 18:21:15]

On 2012/08/09 17:56:42, scottmg wrote:
> On 2012/08/09 17:22:36, Nico wrote:
> > stampy lgtm
> > 
> > You said you wanted to check that this doesn't affect regular build times. I
> > assume you did that.
> 
> Yeah, I didn't notice any difference larger (larger than the noise anyway).

FYI, ukai is implementing the general-purpose limiter I wrote for the
msbuild+goma path: https://chromiumcodereview.appspot.com/10827213/

Also, what is the history of win-tool? Is it absolutely necessary for ninja on
windows?