Modernize usage of 'macOS' in doc and comments

Apple changed the spelling of its operating system again, to "macOS",
effective with macOS 10.12 Sierra (2016-09-20).  Change Emacs
documentation and comments to match this.  Stick with older OS
spellings ("OS X", "Mac OS X") when talking about older releases where
the older names are more correct.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/sysdep.c b/src/sysdep.c
index 460166d119e..674e76db7a0 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -2337,7 +2337,7 @@ posix_close (int fd, int flag)
      closed, and retrying the close could inadvertently close a file
      descriptor allocated by some other thread.  In other systems
      (e.g., HP/UX) FD is not closed.  And in still other systems
-     (e.g., OS X, Solaris), maybe FD is closed, maybe not, and in a
+     (e.g., macOS, Solaris), maybe FD is closed, maybe not, and in a
      multithreaded program there can be no way to tell.
 
      So, in this case, pretend that the close succeeded.  This works