SDL: Update docs/README-porting.md

From 5fb3eb9475399026dce68d35b3d4b63fa476fcf1 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 25 Nov 2022 13:09:04 -0800
Subject: [PATCH] Update docs/README-porting.md

Co-authored-by: Cameron Cawley <ccawley2011@gmail.com>
---
 docs/README-porting.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/README-porting.md b/docs/README-porting.md
index 50fb0fe335de..0a1d88bcea51 100644
--- a/docs/README-porting.md
+++ b/docs/README-porting.md
@@ -13,7 +13,8 @@ There are two basic ways of building SDL at the moment:
 
 1. CMake:  cmake -S . -B build && cmake --build build && cmake --install install
 
-   If you have a GNUish system, then you might try this.  Edit CMakeLists.txt,
+   If you have a system that supports CMake, then you might try this.  Edit CMakeLists.txt,
+
    take a look at the large section labelled:
 
 	"Platform-specific options and settings!"