undefined reference to `const const(char)[] object.Throwable.message()

[rikki cattermole]

As far as I know, no D compiler guarantees compatibility between objects 
built on different version of itself.

The change would have been[0].

[0] 
https://github.com/dlang/druntime/commit/c6762914682d4fa894e2b746bf4bd9ce3ec9f7cb