update-kwsys: Disable custom gitattributes during import
The KWSys `.gitattributes` file now defines custom attributes. Git does not support these in a subdirectory where we are about to place the content, so comment them out during import. This also ensures that the `our-c-style` attribute on KWSys sources does not activate the `format.clang-format` attribute on the third-party import branch.
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