check_legal.regex: allow matching cd-info.exe.

check_common_fn.in: don't erase file cd-info_legal.dump if there is an error.

test/check_common_fn.in

@@ -153,7 +153,6 @@ test_legal_header() {
       echo "  ${line}"
       echo "$0: Failed command:"
       echo "  ${cmd} ${opts}"
-      rm -f "${outfile}"
       exit 4
     fi
   done < ${srcdir}/check_legal.regex

test/check_legal.regex

@@ -1,5 +1,5 @@
-cd-info version [0-9]
-^Copyright (c) 2003
+cd-info version.* [0-9]
+^Copyright (c) 200
 Bernstein
 ^This is free software; see the source for copying conditions\.$
 ^There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A$