[Toybox] [PATCH] Fix toysh build on OpenBSD

[Avery Terrel]

This fixes building, at least, toysh on OpenBSD (7.7) with
allnoconfig+CONFIG_SH=y. Some other toys are broken currently as
documented in PR #505. Hopefully this is more acceptable since
it touches far fewer files.
As an aside, building with both the default CC=`clang` (16.0.6) and
CC=`clang-19` (19.1.7) result in stripped toybox not being recognized
as executable, but I didn't investigate further. It's unlikely,
but possible, that my system is subtly broken and causing this.

# ./toybox sh
exec: Failed to execute process: './toybox' the file could not be run by the operating system.
exec: Maybe the interpreter directive (#! line) is broken?
# ldd toybox
toybox:
toybox: Exec format error
toybox: exit status 1
# file toybox
toybox: ELF 64-bit LSB shared object, x86-64, version 1
# generated/unstripped/toybox sh
$
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