[PATCH 3/3] disable HeapPageBody count test for Ruby 3.1

[Eric Wong <e@80x24.org>]

Ruby 3.1+ uses mmap on platforms relevant to us, so we currently
can't account for it with various malloc wrappers.

Tested on Ruby 3.1.2, this is the only change necessary to
support 3.1.x so far; but the functionality is gone unless
we decide to wrap mmap, as well.
---
 test/test_mwrap.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/test/test_mwrap.rb b/test/test_mwrap.rb
index fadaef6..c506554 100644
--- a/test/test_mwrap.rb
+++ b/test/test_mwrap.rb
@@ -309,7 +309,9 @@ class TestMwrap < Test::Unit::TestCase
         gen <= GC.count && gen >= 0 or abort "bad generation: #{gen}"
         (0 == (addr & 16383)) or abort "addr not aligned: #{'%x' % addr}"
       end
-      nr == ap or abort "HeapPageBody.each missed page #{nr} != #{ap}"
+      if RUBY_VERSION.to_f < 3.1 # 3.1+ uses mmap on platforms we care about
+        nr == ap or abort "HeapPageBody.each missed page #{nr} != #{ap}"
+      end
       10.times { (1..20000).to_a.map(&:to_s) }
       3.times { GC.start }
       Mwrap::HeapPageBody.stat(h)