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Hi,

This patch fixes 4 problems which prevented the VM from building
on Solaris/SPARC.  They shouldn't cause problems for other

platforms (famous last words), so please would someone (Ian?)
confirm this before checking in.

The problems fixed by this patch are:

1. "sun" is already defined by some header or other in Solaris;
   I've changed it to s_un.
2. AF_LOCAL isn't defined on Solaris.  W Richard Stevens'
   "Advanced programming in the Unix environment" says that
   AF_UNIX is more standard anyway.
3. Solaris' feof() call really wants a FILE*.
4. A missing prototype is added for sound_AvailableSpace(void)

1. 
   

With this patch, the VM builds and runs fine if built with gcc-3.4.3.
I've checked both the stock 3.9a-7024 image as well as the
etoys image. (My motivation for this whole exercise is to fix the
problems with audio under Solaris for my young daughter to use
etoys: the first sound plays, but after that, no sounds ever play.)

With gcc-4.2.1 and -O2, the VM won't even start up (complains
about a missing vm-display-X11, even though it's there).  With
gcc-4.2.1 and no -O2, the VM starts, runs for a short while, and
then cores with a bus error.  gdb shows a corrupt stack.  I'm
about to build gcc-4.1.2 and give it a spin building the VM to
try to track this down.  But I do suspect bad code generation
with gcc-4.2.1.