1215 fail on HPPA

[Gcc]

I got a chance to look at the code today, and it seemed the problem is
casued by ./gcc/include/stdarg.h.  It forces the defination
#ifndef __va_list__
#define __va_list__     
#endif
I just commented it out and so far so good :)
The other issue with threads is that inside
gcc/config/pa/pa.h
around line 245
maybe there is an #ifdef we can use to detect if DCE threads is installed
-D_REENTRANT -D_DCE_THREADS

Thanks for a great compiler :)