Update `MRB_FLOAT_FMT` to always use double precision.
#ifndef MRB_NO_FLOAT
#include <mruby/endian.h>
-#ifdef MRB_USE_FLOAT32
-#define MRB_FLOAT_FMT "%.9g"
-#else
#define MRB_FLOAT_FMT "%.17g"
#endif
-#endif
static size_t get_irep_record_size_1(mrb_state *mrb, const mrb_irep *irep);
