4680 nightly and bldenv need to set LC_ALL if they want to fully override the locale

*** 153,162 ****
--- 153,164 ----
          usage
  fi
  
  # force locale to C
  export \
+         LC_ALL=C \
+         LANG=C \
          LC_COLLATE=C \
          LC_CTYPE=C \
          LC_MESSAGES=C \
          LC_MONETARY=C \
          LC_NUMERIC=C \