ash: make ash -c 'if set -o barfoo 2>/dev/null; then echo foo; else echo bar; fi...

ash: make ash -c 'if set -o barfoo 2>/dev/null; then echo foo; else echo bar; fi' work
(fixes bug 1142)

function                                             old     new   delta
options                                              551     565     +14
ash_main                                            1397    1411     +14
setcmd                                                77      90     +13
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