cli: modern_hush: Add upstream commits up to 13 July 2024

cli: modern_hush: Add upstream commits up to 13 July 2024

This commit adds the following hush busybox upstream commits:
23da5c4b716b ("hush: do not exit interactive shell on some redirection errors")
14e28c18ca1a ("hush: fix "exec 3>FILE" aborting if 3 is exactly the next free fd")
6c38d0e9da2d ("hush: avoid duplicate fcntl(F_SETFD, FD_CLOEXEC) during init")
758b21402abc ("hush: detect when terminating "done"/"fi" is missing")
2639f3bc72ac ("hush: set G.ifs sooner (prevents segfault)")

Adding specific ifdef and endif guard was needed for 2639f3bc72ac.

Signed-off-by: Francis Laniel <francis.laniel@amarulasolutions.com>