Fortified scoping in autotest.pl

bin/autotest.pl

@@ -21,10 +21,11 @@ use v5.10;
 use warnings;
 use File::Spec;
 
-$PLATFORM   = (-d "c:\\windows" ? 'windows' : 'unix' );
-$DUMPS      = "dumps";
-$TESTS      = "t";
-$COLORS     = { windows => { ok => 'color 0a', nok => 'color 0c' } };
+my $PLATFORM    = (-d "c:\\windows" ? 'windows' : 'unix' );
+my $COLORS      = { windows => { ok => 'color 0a', nok => 'color 0c' } };
+my $DUMPS       = "dumps";
+my $TESTS       = "t";
+
 
 sub clear {
     if ($PLATFORM eq 'windows') {