DMD 1.031 (two missing functions in std.math)

[Walter Bright]

David L. Davis wrote:
> A two simple wrapper functions should be put back in so existing D
> v1.0 code doesn't break...in this case of course I could simply add
> in replacement functions for these in my own code. But the point
> being that functions should not be removed at this point.

I'll ask Don about it, who has been maintaining std.math.