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6d870d182c
`nvm_download` built a curl/wget command string and ran it with `eval`.
The download URLs embed the version string taken from the mirror's `index.tab`,
which is untrusted.
Wrapping each argument in double quotes inside the `eval` does not prevent command substitution,
so a version field such as `v1$(touch /tmp/proof)` was executed by the shell.
This bypassed the earlier quoting hardening in 0ce8f5a.
Pass every argument as a literal argv element instead of constructing a string for `eval`,
on both the curl and wget paths,
so URL arguments are never re-parsed by the shell.
The wget flag translation is now done per-argument with a POSIX
`set --` loop rather than `sed` over the joined string.
The auth header is sanitized and added once,
before invoking the downloader.