sds: include flb_compat.h for Windows compatibility
sds: include flb_compat.h for Windows compatibility

This is required specifically to fix vsnprintf related errors
occuring in v1.3.4. Read the parent commit for details.

Signed-off-by: Fujimoto Seiji <ef879192bb1e41d519c82cf76440dc8e9a530806@clear-code.com>

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