Add RBIMPL_RVALUE_EMBED_LEN_MAX neeeded by internal/bignum.h
Co-authored-by: xtkoba (Tee KOBAYASHI) xtkoba+ruby@gmail.com
Add RBIMPL_RVALUE_EMBED_LEN_MAX neeeded by internal/bignum.h
Co-authored-by: xtkoba (Tee KOBAYASHI) xtkoba+ruby@gmail.com