Fix macOS SDL build script paths

Author: timangus

misc/macos/build-macos-sdl.sh

@@ -4,9 +4,9 @@
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
-. ${SCRIPT_DIR}/lib-versions.sh
+. ${SCRIPT_DIR}/../lib-versions.sh
 
-ROOT_DIR="$(cd "${SCRIPT_DIR}/.." && pwd)"
+ROOT_DIR="$(cd "${SCRIPT_DIR}/../.." && pwd)"
 
 set -e