Merge "kzip build: pipe error message to stderr." into main

set +e

declare -r kzip_count=$(find "$out" -name '*.kzip' | wc -l)

(($kzip_count>100000)) || { printf "Too few kzip files were generated: %d\n" $kzip_count; exit 1; }

(($kzip_count>100000)) || { >&2 printf "ERROR: Too few kzip files were generated: %d\n" $kzip_count; exit 1; }

# Pack

declare -r allkzip="$KZIP_NAME.kzip"