Various Solaris cc problems with 4.02

[rlpowell]

Hi all!  I don't read this mailing list, so please copy me on responses
if you think I need to see them.

Having some problems (all fixable) with the Solaris 4.2 GHC make.

1.  Sun's cc can't handle empty structs.
    Fix: add char empty; to all those structs.
2.  Sun's cc can't handle zero-length arrays:
  StgWord            stack[0];
    Fix: change the 0 to 1;

Granted, this possibly wastes some memory, but _very_ little.

-Robin