ninja windows: fix wrappers not outputting with newlines
ninja windows: fix wrappers not outputting with newlines

splitlines strips newlines, and I wasn't readding them when writing to stdout.

R=thakis@chromium.org
BUG=chromium:122674

Review URL: https://chromiumcodereview.appspot.com/10068029

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1326 78cadc50-ecff-11dd-a971-7dbc132099af

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