4ae962aba6
src/cmd/ksh93/features/options:
- Fix unportable SHELLMAGIC test:
1. /bin/echo does not work on all systems, but /usr/bin/env is a
de-facto standard path (even NixOS gave in and has it).
2. Do not try to execute a temp file in /tmp as it might be
mounted noexec. Use our own $EXECROOT instead.
- rm unnecessary 'exec 9<&-' (it was never opened globally).
- Remove broken SHOPT_UCB test. It had a syntax error, but the
result is not used anywhere.
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