fix 5.6 compat by removing indexed sprintf (#262)

There is a helper function in ExtUtils::MakeMaker for this, but
that seems excessive to load in EU::Command::MM.

Author: haarg

lib/ExtUtils/Command/MM.pm

@@ -219,8 +219,8 @@ sub perllocal_install {
                            : @ARGV;
 
     my $pod;
-    $pod = sprintf <<'POD', scalar(localtime), $type, $name;
- =head2 %s: C<%s> L<%3$s|%3$s>
+    $pod = sprintf <<'POD', scalar(localtime), $type, $name, $name;
+ =head2 %s: C<%s> L<%s|%s>
 
  =over 4