This is a follow-up to commit ebb0212133.
The day name data appeared twice in the XML files.
Skip the second copy, saving 8.8% of the intermediate file-size.
This makes no change to generated QLocale data.
Change-Id: Ic2cc543a2a85cbb1d2d47ebac7df4fa9ad6ee0a7
Reviewed-by: Lars Knoll <lars.knoll@qt.io>