SDL: Update docs/README-riscos.md

From 7661725b48f3720ba82fd889fc7f857d93b11f00 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 25 Nov 2022 13:08:40 -0800
Subject: [PATCH] Update docs/README-riscos.md

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

diff --git a/docs/README-riscos.md b/docs/README-riscos.md
index d17d173ade5f..5af80a7f31a0 100644
--- a/docs/README-riscos.md
+++ b/docs/README-riscos.md
@@ -20,7 +20,7 @@ The following commands can be used to build SDL for RISC OS using CMake:
     cmake --build build-riscos
     cmake --install build-riscos
 
-When using GCCSDK 4.7.4 release 6 or earlier versions, the builtin atomic functions are broken, meaning it's currently necessary to compile with `--disable-gcc-atomics` using autotools or `-DSDL_GCC_ATOMICS=OFF` using CMake. Newer versions of GCCSDK don't have this problem.
+When using GCCSDK 4.7.4 release 6 or earlier versions, the builtin atomic functions are broken, meaning it's currently necessary to compile with `-DSDL_GCC_ATOMICS=OFF` using CMake. Newer versions of GCCSDK don't have this problem.
 
 
 Current level of implementation