Write "Mac OS X" instead of "MacOS X".

Write "Mac OS X" instead of "MacOS X".

* README: Write "Mac OS X" instead of "MacOS X".
* build-aux/bootstrap: Likewise.
* build-aux/install-reloc: Likewise.
* lib/acl-internal.h: Likewise.
* lib/acl_entries.c: Likewise.
* lib/argp-ba.c: Likewise.
* lib/argp-pv.c: Likewise.
* lib/config.charset: Likewise.
* lib/copy-acl.c: Likewise.
* lib/csharpexec.c: Likewise.
* lib/euidaccess.c: Likewise.
* lib/fbufmode.c: Likewise.
* lib/fflush.c: Likewise.
* lib/file-has-acl.c: Likewise.
* lib/filemode.h: Likewise.
* lib/fpurge.c: Likewise.
* lib/freadable.c: Likewise.
* lib/freadahead.c: Likewise.
* lib/freading.c: Likewise.
* lib/freadptr.c: Likewise.
* lib/freadseek.c: Likewise.
* lib/fseeko.c: Likewise.
* lib/fseterr.c: Likewise.
* lib/fsusage.c: Likewise.
* lib/fwritable.c: Likewise.
* lib/fwriting.c: Likewise.
* lib/get-rusage-as.c: Likewise.
* lib/get-rusage-data.c: Likewise.
* lib/getdomainname.c: Likewise.
* lib/idpriv-drop.c: Likewise.
* lib/idpriv-droptemp.c: Likewise.
* lib/localcharset.c: Likewise.
* lib/locale.in.h: Likewise.
* lib/localename.c: Likewise.
* lib/mbsrtowcs-state.c: Likewise.
* lib/nproc.c: Likewise.
* lib/passfd.c: Likewise.
* lib/posix_openpt.c: Likewise.
* lib/printf-parse.c: Likewise.
* lib/progreloc.c: Likewise.
* lib/safe-read.h: Likewise.
* lib/safe-write.h: Likewise.
* lib/sched.in.h: Likewise.
* lib/set-mode-acl.c: Likewise.
* lib/signal.in.h: Likewise.
* lib/stdint.in.h: Likewise.
* lib/stdio-impl.h: Likewise.
* lib/stdlib.in.h: Likewise.
* lib/strtod.c: Likewise.
* lib/sys_select.in.h: Likewise.
* lib/tcgetsid.c: Likewise.
* lib/unistd.in.h: Likewise.
* lib/unlockpt.c: Likewise.
* lib/vasnprintf.c: Likewise.
* lib/vma-iter.c: Likewise.
* lib/wcsrtombs-state.c: Likewise.
* m4/acl.m4: Likewise.
* m4/acosl.m4: Likewise.
* m4/asinl.m4: Likewise.
* m4/atanl.m4: Likewise.
* m4/c-stack.m4: Likewise.
* m4/cosl.m4: Likewise.
* m4/expl.m4: Likewise.
* m4/extensions.m4: Likewise.
* m4/fdatasync.m4: Likewise.
* m4/fmal.m4: Likewise.
* m4/frexp.m4: Likewise.
* m4/frexpf.m4: Likewise.
* m4/frexpl.m4: Likewise.
* m4/fsusage.m4: Likewise.
* m4/getdomainname.m4: Likewise.
* m4/getloadavg.m4: Likewise.
* m4/getopt.m4: Likewise.
* m4/gettext.m4: Likewise.
* m4/gnulib-common.m4: Likewise.
* m4/intdiv0.m4: Likewise.
* m4/intlmacosx.m4: Likewise.
* m4/largefile.m4: Likewise.
* m4/ldexpl.m4: Likewise.
* m4/link-follow.m4: Likewise.
* m4/locale-ar.m4: Likewise.
* m4/locale-fr.m4: Likewise.
* m4/locale-ja.m4: Likewise.
* m4/locale-tr.m4: Likewise.
* m4/locale-zh.m4: Likewise.
* m4/locale_h.m4: Likewise.
* m4/lock.m4: Likewise.
* m4/logl.m4: Likewise.
* m4/mathfunc.m4: Likewise.
* m4/minus-zero.m4: Likewise.
* m4/mktime.m4: Likewise.
* m4/mmap-anon.m4: Likewise.
* m4/multiarch.m4: Likewise.
* m4/nanosleep.m4: Likewise.
* m4/nocrash.m4: Likewise.
* m4/poll.m4: Likewise.
* m4/printf-frexpl.m4: Likewise.
* m4/printf.m4: Likewise.
* m4/signbit.m4: Likewise.
* m4/sinl.m4: Likewise.
* m4/sqrtl.m4: Likewise.
* m4/strerror_r.m4: Likewise.
* m4/tanl.m4: Likewise.
* m4/threadlib.m4: Likewise.
* m4/ttyname_r.m4: Likewise.
* m4/unlink.m4: Likewise.
* m4/visibility.m4: Likewise.
* m4/wcwidth.m4: Likewise.
* tests/minus-zero.h: Likewise.
* tests/test-alloca-opt.c: Likewise.
* tests/test-copy-acl.sh: Likewise.
* tests/test-copy-file.sh: Likewise.
* tests/test-fdatasync.c: Likewise.
* tests/test-file-has-acl.sh: Likewise.
* tests/test-flock.c: Likewise.
* tests/test-fsync.c: Likewise.
* tests/test-localename.c: Likewise.
* tests/test-malloca.c: Likewise.
* tests/test-nonblocking-pipe.h: Likewise.
* tests/test-nonblocking-socket.h: Likewise.
* tests/test-openpty.c: Likewise.
* tests/test-posix_openpt.c: Likewise.
* tests/test-ptsname.c: Likewise.
* tests/test-ptsname_r.c: Likewise.
* tests/test-sameacls.c: Likewise.
* tests/test-select.h: Likewise.
* tests/test-set-mode-acl.sh: Likewise.
* tests/test-snprintf-posix.h: Likewise.
* tests/test-sprintf-posix.h: Likewise.
* tests/test-strtod.c: Likewise.
* tests/test-time.c: Likewise.
* tests/test-vasnprintf-posix.c: Likewise.
* tests/test-vasprintf-posix.c: Likewise.
* doc/acl-resources.txt: Likewise.
* doc/**/*.texi: Likewise.
Reported by Max Horn <max@quendi.de>.