Revert "Test Array.append for multiple Iterables as args"

This reverts commit 859d37e.

Makes things inconsistent still. Discussion:
https://irclog.perlgeek.de/perl6-dev/2017-06-16#i_14743982

Author: zoffixznet

S32-array/create.t

@@ -1,6 +1,6 @@
 use v6;
 use Test;
-plan 13;
+plan 12;
 
 # L<S32::Containers/"Array"/"=item ">
 
@@ -65,24 +65,4 @@ eval-lives-ok ｢(1,2,3).Array[0]++｣,
     is-deeply Array.clone, Array, 'Array:U clone gives an Array:U';
 }
 
-subtest 'Array.append with multiple Iterables' => {
-    plan 4;
-
-    my @b = 1, 2, 3;
-    my @c := (4, 5, 6);
-    my %d = :42a;
-
-    my @res1;
-    is-deeply @res1.append(@b, @c, %d), [1, 2, 3, 4, 5, 6, :42a],
-        '.append flattens all Iterables (return value)';
-    is-deeply @res1, [1, 2, 3, 4, 5, 6, :42a],
-        '.append flattens all Iterables (result)';
-
-    my @res2;
-    is-deeply @res2.append([@b, 2], [1, @c], [3, %d]), [@b, 2, 1, @c, 3, %d],
-        '.append leaves containerized Iterables intact (return value)';
-    is-deeply @res2, [@b, 2, 1, @c, 3, %d],
-        '.append leaves containerized Iterables intact (result)';
-}
-
 # vim: ft=perl6