SDL: emscripten-buildbot.sh: force `-s USE_SDL=0`

From 51be30f3cd29682cd94fcbfbe18eeac492095a05 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Wed, 17 Aug 2022 21:37:32 -0400
Subject: [PATCH] emscripten-buildbot.sh: force `-s USE_SDL=0`

This avoids using Emscripten-provided SDL headers from its own
sysroot instead of the headers in our own include directory!

Reference https://github.com/emscripten-core/emscripten/discussions/17647
---
 build-scripts/emscripten-buildbot.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build-scripts/emscripten-buildbot.sh b/build-scripts/emscripten-buildbot.sh
index 0898d747d69..8538c45aeca 100755
--- a/build-scripts/emscripten-buildbot.sh
+++ b/build-scripts/emscripten-buildbot.sh
@@ -55,7 +55,7 @@ mkdir buildbot
 pushd buildbot
 
 echo "Configuring..."
-emconfigure ../configure --host=wasm32-unknown-emscripten --disable-assembly --disable-threads --disable-cpuinfo CFLAGS="-O2 -Wno-warn-absolute-paths -Wdeclaration-after-statement -Werror=declaration-after-statement" --prefix="$PWD/emscripten-sdl2-installed" || exit $?
+emconfigure ../configure --host=wasm32-unknown-emscripten --disable-assembly --disable-threads --disable-cpuinfo CFLAGS="-s USE_SDL=0 -O2 -Wno-warn-absolute-paths -Wdeclaration-after-statement -Werror=declaration-after-statement" --prefix="$PWD/emscripten-sdl2-installed" || exit $?
 
 echo "Building..."
 emmake $MAKE || exit $?