Fix build-sdl.sh script error

``` cat: HEAD: No such file or directory ```` Use the proper git command to get the commit ID for HEAD.
ares-emulator · Feb 5, 2025 · f068dd7 · f068dd7
1 parent 04c608a
commit f068dd7
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/thirdparty/SDL/build-sdl.sh b/thirdparty/SDL/build-sdl.sh
@@ -6,7 +6,7 @@ if [ ! -d "SDL" ]; then
 else
     git -C SDL fetch
 fi
-git -C SDL reset --hard "$(cat HEAD)"
+git -C SDL reset --hard "$(git -C SDL rev-parse HEAD)"
 mkdir -p SDL/build
 pushd SDL/build