winbuild: Use CALL to run batch scripts
Co-authored-by: Stefan Kanthak Closes https://github.com/curl/curl/issues/2330 Closes https://github.com/curl/curl/pull/2331
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Co-authored-by: Stefan Kanthak Closes https://github.com/curl/curl/issues/2330 Closes https://github.com/curl/curl/pull/2331