SDL: INSTALL.txt: Say "macOS" instead of "Mac OS X" in modern times.

From 1ee196b483688a58dcf95ddf4c792d0f8cea17c5 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Tue, 15 Mar 2022 13:07:34 -0400
Subject: [PATCH] INSTALL.txt: Say "macOS" instead of "Mac OS X" in modern
 times.

Reference Issue #5407.
---
 INSTALL.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/INSTALL.txt b/INSTALL.txt
index efb01d26c99..f570cb33fd0 100644
--- a/INSTALL.txt
+++ b/INSTALL.txt
@@ -8,10 +8,10 @@ To compile and install SDL:
         * Read the FAQ at https://wiki.libsdl.org/FAQWindows
         * Run './configure; make; make install'
 
-        Mac OS X with Xcode:
+        macOS with Xcode:
         * Read docs/README-macosx.md
 
-        Mac OS X from the command line:
+        macOS from the command line:
         * Run './configure; make; make install'
 
         Linux and other UNIX systems: