[Bug libstdc++/97570] avr-gcc: error: 'void* memalign' redeclared as different kind of entity

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97570

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for 8.5, 9.4 and 10.4