* Get rid of the RCS Header stuff.  They're meaningless in git.
 * Add public domain comment to some of the files if the only comment
   was the RCS header.

lisp/elf.c:
lisp/mach-o.c:
o Remove obj_cleanup function.

lisp/save.c:
o Don't call obj_cleanup anymore (because it doesn't exist.)

toosl/linker-x86.sh:
o Remove CORRO.o CORSTA.o CORDYN.o on exit.

address of the core sections.  In map_core_sections, we can map them
to the correct addresses, just like we do on Solaris.

lisp/elf.c:
o Mmap the Lisp core sections with the correct address, not using the
  one in the executable itself, just like on Solaris.

lisp/mach-o.c:
o Add the array of addresses of the dynamic, static, and read-only
  spaces.
o Mmap the Lisp core sections with the correct address, not using the
  one in the executable itself, just like on Solaris.
o Small update to print out the names of the spaces, just like for elf
  files.

tools/linker-x86.sh:
o Don't need to tell the linker the starting addresses of the sections
  anymore for Linux and Darwin.  map_core_sections handles that.

o Disable all of those debugging prints.
o Add ability to enable those debugging prints if desired.  (May go a
  way some day.)
o Get rid of some compiler warnings.
o Get rid of the global eh variable; it's not required to be global.

images.

lisp/elf.c:
o Change write_elf_object, elf_cleanup, and elf_run_linker to
  write_space_object, obj_cleanup, and obj_run_linker.

lisp/elf.h:
o Update so that this can used for both elf and mach-o.  Not great,
  but I don't want to rename this file.

lisp/mach-o.c:
o Include elf.h
o Remove items that are defined in elf.h.
o Change function names from elf to mach_o.

lisp/save.c:
o Update names to new ones.

executable appears to work!

bootfiles/20a/boot-2010-07-1.lisp:
o Add :executable for darwin/x86.

code/bsd-os.lisp:
o Make :elf and :mach-o runtime features too.
o Register :executable of :executable is defined.

lisp/Config.x86_darwin:
o Need mach-o.c
o Add exec-final.c

lisp/lisp.c:
o Don't include elf.h if we're on Darwin since Darwin uses Mach-O, not
  ELF.
o For Darwin, we get the initial function address from
  initial_function_addr, not from &initial_function_addr, like for
  Linux.

lisp/save.c
o Don't include libgen.h and elf.h on Darwin.

tools/linker-x86.sh:
o Update to support Darwin.

tools/make-main-dist.sh:
o Add support for executables on Darwin.

lisp/mach-o.c:
o Initial support for writing Mach-O files for the Lisp spaces.
o Initial support for reading a Mach-O executable to find and map the
  Lisp spaces.