std::copysign not a member of std

[kas1e]

Like all the other ones, std::copysign also saying that this is not a member of std. Test case:

#include <iostream>
#include <cmath>

int main(void)
{
    std::cout << "copysign(1.0,+2.0) = " << std::copysign(1.0,+2.0) << '\n';
}

[kas1e]

from newlib's side everything about "not a member of std::" was fixed in the new beta of newlib 53.69 and adtools recompiled with new newlib's headers.