Fix the world rebuilding in make 3.82.
Fix the world rebuilding in make 3.82.

Filter out the propgation of FORCE_DO_CMD when prerequisites change.
Review URL: http://codereview.chromium.org/7583040

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@987 78cadc50-ecff-11dd-a971-7dbc132099af

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