Arrange so that no options COREDUMP and no options PTRACE work together.
Thanks to Paul Goyette for testing.

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation mo

Move all non-emulation-specific coredump code into the coredump module,
and remove all #ifdef COREDUMP conditional compilation. Now, the
coredump module is completely separated from the emulation modules, and
they can all be independently loaded and unloaded.

Welcome to 9.99.18 !

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Set WARNS=3 to appease sign-compare warnings for mips, mips64, and sparc.

Disable PAX_ASLR on sh3 as well. exec_elf32 module doesn't work with it
at least on dreamcast.

Not all platforms can do PaX stuff. The list was derived in private
conversation with several developers. The change was tested on
sparc64.

NetBSD ultra.example.ca 5.99.17 NetBSD 5.99.17 (MODULAR)

Not all platforms can do PaX stuff. The list was derived in private
conversation with several developers. The change was tested on
sparc64.

NetBSD ultra.example.ca 5.99.17 NetBSD 5.99.17 (MODULAR) #0: Tue Sep 15 19:08:02 PDT 2009 jnemeth@ultra.example.ca:/usr/local/current/objdir/sys/arch/sparc64/compile/MODULAR sparc64

NAME CLASS SOURCE REFS SIZE REQUIRES
...
exec_elf64 misc filesys 0 6981 coredump
...

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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

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

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