guile 1.5.4 SGI Irix 6.3 SGI C snprintf in version.c

[Bill Schottstaedt]

I think that the SGI C compiler/library for Irix 6.3 does not
include snprintf used in libguile/version.c around line 83.
I changed it to use sprintf to continue compilation.

Also, less certain about this (our SGI's here are a mess),
but I think uint32_t is defined in sys/types.h but the
configure macro HAVE_UINT32_T doesn't get defined, so
socket.c complains about redefining that type.