zstd: Add a missing include

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

include/fluent-bit/flb_zstd.h

@@ -22,6 +22,7 @@
 
 #include <fluent-bit/flb_info.h>
 #include <zstd.h>
+#include <zstd_errors.h>
 
 struct flb_decompression_context;