Deleted unneeded modules.

misc-scripts/binary_delta/apply.pl

@@ -17,8 +17,6 @@
 use strict;
 use warnings;
 
-use Cwd;
-
 use File::Basename;
 use File::Copy;
 

misc-scripts/binary_delta/build.pl

@@ -16,10 +16,7 @@
 use strict;
 use warnings;
 
-use Cwd;
-
 use File::Basename;
-use File::Copy;
 
 use Getopt::Std;