[svn r354] Fix the regressions between [346] and [353] by making constructors and destructors outside classes fatal errors. Fix tests makefile and add minimize to gc.d.

module comma;

void main()
{
    int i=0,j=0;
    for (; i<10; i++,j++)
    {
    }
    assert(i == 10);
    assert(j == 10);
}