setup.sh: arithmetic conditional style
used "recommended" arithmetic conditional style
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@ -644,7 +644,7 @@ export NIX_INDENT_MAKE=1
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if [ -z "${NIX_BUILD_CORES:-}" ]; then
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NIX_BUILD_CORES="1"
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elif [ "$NIX_BUILD_CORES" -le 0 ]; then
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elif (( "$NIX_BUILD_CORES" <= 0 )); then
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NIX_BUILD_CORES=$(nproc 2>/dev/null || true)
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if expr >/dev/null 2>&1 "$NIX_BUILD_CORES" : "^[0-9][0-9]*$"; then
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:
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