compat_sunos depends upon compat_09. fixes:

[ 1.8785495] WARNING: module error: built-in module compat_sunos can't find builtin dependency `compat_09'
[ 1.8785495] WARNING: module error: built-in module compat_sunos prerequisite compat_09 failed, error 2

Merge the [pgoyette-compat] branch

branches: 1.9.18;
Define compat modules (but without dependencies yet).

branches: 1.8.26;
Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.7.122; 1.7.126; 1.7.132; 1.7.136;
don't build these files if we're doing compat_netbsd32 as well.
a different set are required.

put aout specific sunos code from sunos_exec.c to separate file
sunos_exec_aout.c
make LKM safe
add EMUL_GETPID_PASS_PPID|EMUL_GETID_PASS_EID to emul_sunos flags

branches: 1.5.12;
if syscall_debug & compat_sunos, include sunos_syscalls.c

branches: 1.4.8;
config.new => config

Use compat_util.[ch]

Go with the flow; use `/emul/sunos' pseudo-root (from Matthew Green).
Note: sunos_stat() and sunos_lstat() were added too.

Try to make the reboot system call compile under sun3 with RB_STRING
support [not tested]
Add files.sunos
Rename system call switch table file from sunos_init_sysent.c to sunos_sysent.c
like other emulations.