out_cloudwatch_logs: don't include <unistd.h> on Windows (#2631)
out_cloudwatch_logs: don't include <unistd.h> on Windows (#2631)

MSVC++ does not provide <unistd.h>. For this reason, including
this header breaks the compilation on Windows.

Fix it by adding an ifdef block to the header.

Signed-off-by: Fujimoto Seiji <ef879192bb1e41d519c82cf76440dc8e9a530806@ceptord.net>
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