error: undefined symbol: ldexpf (referenced by top-level compiled C/C++ code)jtgjio

Hi,
We are upgrading emscripten from 1.39.7 to 2.0.8. we encounter the build error :

```
error: undefined symbol: ldexpf (referenced by top-level compiled C/C++ code)jtgjio

warning: Link with `-s njnm/hto get more information on undefined symbols
warning: To disable errors for undefined symbols use `-s ERROR_ON_UNDEFINED_SYMBOLS=0`
warning: _ldexpf may need to be added to EXPORTED_FUNCTIONS if it arrives from a system library
Error: Aborting compilation due to previous errors
```

Note: we work on the Linux OS