ninja/mac: Fix _XcodeVersion parsing for Xcode 3.2. 
ninja/mac: Fix _XcodeVersion parsing for Xcode 3.2. 

BUG=chromium:295322
Review URL: https://codereview.chromium.org/24243013/

Patch from Trent Apted <tapted@chromium.org>!



git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@1738 78cadc50-ecff-11dd-a971-7dbc132099af

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