Removed GNU extension to printf command in DIFF unit testing script.

Author: Lethja

test/DIFF/test.sh

@@ -13,7 +13,7 @@ test_case() {
   patch -s --posix --batch -p0 < "diff-lua"
   if { set +e; cmp -s a.txt b.txt; }; then
     printf "\tCASE %s: PASS\n" "$1"
-    printf "\t\tSIZE:\n\t\t\tGNU: %'6d\n\t\t\tLUA: %'6d\n"\
+    printf "\t\tSIZE:\n\t\t\tGNU: %6d\n\t\t\tLUA: %6d\n"\
       "$(stat -L -c%s diff-gnu)"\
       "$(stat -L -c%s diff-lua)"
   else