v6.5 build change for SunOS 5.6

version of Postgres: 6.5
OS:  SPARC SunOS 5.6
changes required:

gcc compilation failed on src/backend/lib/stringinfo.c because "va_list"
was undefined.  This was fixed by adding

#include <stdarg.h>

to the stringinfo.c source before the other includes.

Regards,
Carleton DeTar