removed mv-exchange checks in build-gnu.sh

Author: hz2

util/build-gnu.sh

@@ -372,8 +372,6 @@ sed -i  "s/color_code='0;31;42'/color_code='31;42'/" tests/ls/color-clear-to-eol
 # patching this because of the same reason as the last one.
 sed -i  "s/color_code='0;31;42'/color_code='31;42'/" tests/ls/quote-align.sh
 
-# Slightly different error message
-sed -i 's/not supported/unexpected argument/' tests/mv/mv-exchange.sh
 # Most tests check that `/usr/bin/tr` is working correctly before running.
 # However in NixOS/Nix-based distros, the tr util is located somewhere in
 # /nix/store/xxxxxxxxxxxx...xxxx/bin/tr