bf_atof_internal should check USE_BF_DEC macro before using bfdec_normalize_and_round

[laishere]

When I tried to compile quickjs, I found there's a missing macro check in bf_atof_internal function.

quickjs/libbf.c

Line 3110 in 36911f0

ret = bfdec_normalize_and_round((bfdec_t *)a, prec, flags);

bfdec_normalize_and_round is defined under USE_BF_DEC flag, and bf_atof_internal trys to access it without the same flag.

[chqrlie]

Thank you for reporting this. I shall fix this bug shortly.

[HarlonWang]

I think this issue hasn't been fixed yet. I made a simple fix, I'm not sure if it's the same as your fix. You can take a look #354 for details. @chqrlie