fix: add mac os

Signed-off-by: Xinwei Xiong (cubxxw) <3293172751nss@gmail.com>

scripts/lib/logging.sh

@@ -20,7 +20,7 @@ OPENIM_VERBOSE="${OPENIM_VERBOSE:-5}"
 ENABLE_LOGGING="${ENABLE_LOGGING:-true}"
 
 # If OPENIM_OUTPUT is not set, set it to the default value
-if [[ ! -v OPENIM_OUTPUT ]]; then
+if [ -z "${OPENIM_OUTPUT+x}" ]; then
     OPENIM_OUTPUT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../../_output" && pwd -P)"
 fi