Have scons fully evaluate order-only prequisites Nodes before evaluating a target direct sources and dependencies, so that the actions of the prerequisites can affect how the sources and dependencies get built (e.g. building ancillary files for use as input to other steps, without having to track the direct file dependency).
Have scons fully evaluate order-only prequisites Nodes before evaluating
a target direct sources and dependencies, so that the actions of the
prerequisites can affect how the sources and dependencies get built
(e.g. building ancillary files for use as input to other steps, without
having to track the direct file dependency).

This tracks an upstream SCons change that will appear in next release:
  http://scons.tigris.org/issues/show_bug.cgi?id=2372
Review URL: http://codereview.chromium.org/43087

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@11461 0039d316-1c4b-4281-b951-d872f2087c98

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