The sed chain grew with each tweak and fails silently: a pattern that
misses leaves the default in place, a wildcard like CONFIG_FTP\w* may
catch symbols added by a future upstream, and kconfig quietly discards
values it rejects. List the overrides in src/busybox.config instead.
Kconfig keeps the first assignment of each symbol and ignores later
ones, so prepending the overrides to the stock defconfig makes them
win. After configuring, every override must appear verbatim in .config,
or the build fails and prints the ones that did not take (unknown
symbol, out-of-range value, unmet dependency).
The resulting .config is identical to the sed chain's for both x64 and
x86.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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