Complex.c

[Craig Black]

I notice that there was both C and D source in the phobos internal library
code.  Anyone know why?

Another thing ... I looked at complex.h and noticed that the functions were
passing Complex by value.  That is not as efficient as using references for
a data structure with 2 long doubles.  Given that a long double is 80 bits,
and each needs to be aligned appropriately, the Complex data structure is at
least 8 bytes long.  So it seems that passing by reference would be faster,
but maybe I'm missing something.

-Craig