build: don't crash if uci-defaults directory already exists #1150
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When two builds are submitted for the same target/version and both include uci-defaults, then the second build fails with
FileExistsError: [Errno 17] File exists: '.../files/etc/uci-defaults'
Links: https://forum.openwrt.org/t/owut-openwrt-upgrade-tool/200035/394