trimming getloadavg's dependencies

[Paul Eggert]

When I tried to add the getloadavg module to GNU Emacs,
I brought in a whole bunch of new files (see below)
due to all the dependencies.  This seems like way overkill.

For example, if the c-strtod module is not otherwise being
used, we can break the dependency on c-strtod by
parsing the floating point number by hand; that may not
be as precise but it's good enough for a load average.

Any objections to trying that sort of thing?  The list
below really does seem excessive.

  lib/c-strtod.c
  lib/c-strtod.h
  lib/cloexec.c
  lib/cloexec.h
  lib/creat-safer.c
  lib/dup-safer.c
  lib/dup2.c
  lib/fcntl--.h
  lib/fcntl-safer.h
  lib/fcntl.c
  lib/fcntl.in.h
  lib/fd-safer.c
  lib/getdtablesize.c
  lib/locale.in.h
  lib/malloc.c
  lib/open-safer.c
  lib/open.c
  lib/pipe-safer.c
  lib/stat.c
  lib/stdint.in.h
  lib/stdlib.in.h
  lib/strdup.c
  lib/string.in.h
  lib/sys_stat.in.h
  lib/unistd--.h
  lib/unistd-safer.h
  lib/wchar.in.h
  m4/cloexec.m4
  m4/dos.m4
  m4/dup2.m4
  m4/fcntl-o.m4
  m4/fcntl-safer.m4
  m4/fcntl.m4
  m4/fcntl_h.m4
  m4/getdtablesize.m4
  m4/locale_h.m4
  m4/longlong.m4
  m4/malloc.m4
  m4/mode_t.m4
  m4/open.m4
  m4/stat.m4
  m4/stdint.m4
  m4/stdlib_h.m4
  m4/strdup.m4
  m4/string_h.m4
  m4/sys_stat_h.m4
  m4/unistd-safer.m4
  m4/wchar_h.m4
  m4/wint_t.m4