Overnigth tests are failing: variables of strip-binaries not declared

Job #145139973 failed for 993e30ae:

Failed to resolve one or more variable:
  unresolved variable 'objcopy-link-args' in declaration of 'strip-binaries' at: /builds/BuildStream/buildstream/freedesktop-sdk/project.conf [line 66 column 18]
  unresolved variable 'strip-args' in declaration of 'strip-binaries' at: /builds/BuildStream/buildstream/freedesktop-sdk/project.conf [line 66 column 18]
  unresolved variable 'objcopy-extract-args' in declaration of 'strip-binaries' at: /builds/BuildStream/buildstream/freedesktop-sdk/project.conf [line 66 column 18]

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