Support for compiling for bare metal/embedded targets

[chiefnoah]

I'm looking to embed chibi-scheme into an embedded system on bare metal (no OS, or a RTOS) but am running into problems related to <sys/socket.h>, -dl, and -lutil. Is it even possible to support a target like this without substantial rework?

[ashinn]

<sys/socket.h> is only needed for the shutdown logic in sexp_finalize_port, I can make that optional.

-ldl is already optional. I'm not sure if -lutil is needed for anything other than (chibi pty), let me double check.