enable deps mode on windows too

already enabled on non-windows. keeps use_deps=0 available as opt-out.

R=thakis@chromium.org
BUG=chromium:245034

Review URL: https://codereview.chromium.org/16925005

git-svn-id: http://gyp.googlecode.com/svn/trunk@1647 78cadc50-ecff-11dd-a971-7dbc132099af
fix flock-related tests on linux/mac after r1646

flock not used on ninja now in favour of pool functionality.

R=thakis@chromium.org

Review URL: https://codereview.chromium.org/17055004

git-svn-id: http://gyp.googlecode.com/svn/trunk@1648 78cadc50-ecff-11dd-a971-7dbc132099af
switch go/gypbot from vs2008 to vs2012

Per
https://groups.google.com/forum/?fromgroups#!topic/gyp-developer/OviErZ6vR1A
move 2008 to 2012.

R=bradnelson@google.com

Review URL: https://codereview.chromium.org/17035011

git-svn-id: http://gyp.googlecode.com/svn/trunk@1649 78cadc50-ecff-11dd-a971-7dbc132099af