Add Linux/PPC(64) to stat.d

The definition follows the Linux kernel. The change is required in
order to compile druntime on Linux/PPC(64).
Merge pull request #468 from redstar/ppcstat

Add Linux/PPC(64) to stat.d
complex.c is never called
Merge pull request #469 from WalterBright/rm_complex_d

complex.c is never called