Ignore md5sha1sum version detect failure on macos (#748)

Author: arjunsuresh

script/get-generic-sys-util/meta.yaml

@@ -646,6 +646,12 @@ variations:
       MLC_SYS_UTIL_VERSION_CMD: md5sum --version | grep sha1sum
       MLC_SYS_UTIL_VERSION_RE: \b(\d+\.\d+(?:\.\d+)?)\b
       MLC_TMP_VERSION_DETECT_GROUP_NUMBER: 0
+    update_meta_if_env:
+      - enable_if_env:
+          MLC_HOST_OS_FLAVOR:
+            - macos
+        env:
+          MLC_GENERIC_SYS_UTIL_IGNORE_VERSION_DETECTION_FAILURE: yes
     new_env_keys:
     - MLC_MD5SHA1SUM_VERSION
     state: