win: Set TargetMachine and MinimumRequiredVersion
win: Set TargetMachine and MinimumRequiredVersion

Required for running binaries on XP.

R=mark@chromium.org
BUG=crashpad:50

Review URL: https://codereview.chromium.org/1335043002 .

bowlofstew/mini_chromium,bowlofstew/mini_chromium,chromium/mini_chromium,chromium/mini_chromium,chromium/mini_chromium,bowlofstew/mini_chromium,Chilledheart/mini_chromium,Chilledheart/mini_chromium,Chilledheart/mini_chromium