xcopy: Avoid using isdigit() for WCHARs.

[Akihiro Sagawa]

Found with Coccinelle.

Signed-off-by: Akihiro Sagawa <sagawa.aki at gmail.com>
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 programs/xcopy/xcopy.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

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