add HAVE_RB_EXT_RACTOR_SAFE macro
define HAVE_RB_EXT_RACTOR_SAFE to check rb_ext_ractor_safe() is available or not.
add HAVE_RB_EXT_RACTOR_SAFE macro
define HAVE_RB_EXT_RACTOR_SAFE to check rb_ext_ractor_safe() is
available or not.