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There seem to be two causes of worry.  The actual compiler
error in your build log and the use of _SGIAPI that
Casavanti warns again.

It looks like the compiler problems is because our
inet_ntop() prototype is wrong.  That is Python says the
last argument is a socklen_t, but IRIX and Linux man pages
both say size_t.  Perhaps size_t and socklen_t are different
sizes on IRIX, but not on Linux.  What happens if you change
it to size_t?

The problematic code would appear to be these lines from
socketmodule.c:

#if defined(__sgi)&&_COMPILER_VERSION>700 && !_SGIAPI
/* make sure that the reentrant (gethostbyaddr_r etc)
   functions are declared correctly if compiling with
   MIPSPro 7.x in ANSI C mode (default) */
#define _SGIAPI 1
#include "netdb.h"
#endif

It's the only use the _SGIAPI symbol that Casavant says we
shouldn't use.  What happens if you remove the use _SGIAPI,
i.e. just make it

#if defined(__sgi) && _COMPILER_VERSION > 700 
/* make sure that the reentrant (gethostbyaddr_r etc)
   functions are declared correctly if compiling with
   MIPSPro 7.x in ANSI C mode (default) */
#include "netdb.h"
#endif