tests: fix non-portable iconv invocation
The iconv that comes with a FreeBSD 11.2-RELEASE-p2 box I have access to doesn't support the SHIFT-JIS encoding. Guard a test added in e92d6225 ("convert: add round trip check based on 'core.checkRoundtripEncoding'", 2018-04-15) first released with Git v2.18.0 with a prerequisite that checks for its availability. The iconv command is in POSIX, and we have numerous tests unconditionally relying on its ability to convert ASCII, UTF-8 and UTF-16, but unconditionally relying on the presence of more obscure encodings isn't portable. Signed-off-by: NÆvar Arnfjörð Bjarmason <avarab@gmail.com> Reviewed-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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