Fixed some unmerged parts of the D2 frontend. Removed the automatic linker flags for D2 (temp). Renamed a runtime function for D2.

module complex3;

void main()
{
    cfloat c1 = 1f + 0i;
    cfloat c2 = 0f + 0i;
    c2 += 1f + 0i;
    assert(c1 == c2);
}