Portability patch for Makefile.PL (rt.cpan.org, #2070)

--- ./Makefile.PL
+++ ./Makefile.PL
@@ -24,7 +24,7 @@ else {
 }
 
 print "Checking $perl_path is the same version as this one...";
-chomp(my $V = `$perl_path -MConfig -le 'print Config->myconfig'`);
+chomp(my $V = `$perl_path -MConfig -le 'print(Config->myconfig())'`);
 if ($V eq Config->myconfig) {
     print "ok\n";
 }