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, 2 insertions, 2 deletions

diff --git a/INSTALL b/INSTALL
index 119b4d4dd1d..ade9bcbf463 100644
--- a/INSTALL
+++ b/INSTALL
@@ -5,7 +5,7 @@ See the end of the file for license conditions.
 
 
 This file contains general information on building GNU Emacs.
-For more information specific to the MS-Windows, GNUstep/Mac OS X, and
+For more information specific to the MS-Windows, GNUstep/macOS, and
 MS-DOS ports, also read the files nt/INSTALL, nextstep/INSTALL, and
 msdos/INSTALL.  For information about building from a repository checkout
 (rather than a release), also read the file INSTALL.REPO.
@@ -208,7 +208,7 @@ corresponding command is 'yum-builddep emacs'.
 
 DETAILED BUILDING AND INSTALLATION:
 
-(This is for a Unix or Unix-like system.  For GNUstep and Mac OS X,
+(This is for a Unix or Unix-like system.  For GNUstep and macOS,
 see nextstep/INSTALL.  For non-ancient versions of MS Windows, see
 the file nt/INSTALL.  For MS-DOS and MS Windows 3.X, see msdos/INSTALL.)