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

@@ -153,10 +153,12 @@
         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 \