ldc + druntime unittest build fail

[denizzzka]

$ cmake --install-prefix=/tmp/2 ../ldc
[...]
$ make -j12 druntime-ldc-unittest
[...]
core/exception.d(700): Error: Function type does not match previously declared function with the same mangled name: `onOutOfMemoryError`
core/exception.d(700):        Previous IR type: void (i8*)
core/exception.d(700):        New IR type:      void (i8*, { i64, i8* }, i64)

I think this is because the ldc compiler is behind of druntime srcs: dlang/dmd@b6740a2

I don't know if this is normal or not

[adamdruppe]

Probably another thing I missed while merging ldc's patches. If you can make it pass, go ahead and patch it up.

[denizzzka]

(ldc upstream still not fixed)