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this function discards all values that come from a specific file. it will be needed for configure bootstrapping, but is too obscure to document it for general use. Change-Id: I62c18aeb1847712e33d0599dbb0b90ffa1722438 Reviewed-by: Lars Knoll <lars.knoll@qt.io> (cherry picked from qtbase/12bb328bb0be8efe54aae750c21938aab4d17539)
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