std::strtold() missing

[ksdhans]

Std::strtold() is still missing. Looking in the cstdlib header file, it's been excluded via multiple #ifndef amigaos4 blocks. Strtold() is now available, so this should be removed.

[3246251196]

I cannot reproduce this with GCC 11.3.

The example in: https://cplusplus.com/reference/cstdlib/strtold/

runs fine.