[ruby/openssl] test_bn.rb: AWS-LC does not support BN::CONSTTIME

AWS-LC does not support BN_FLG_CONSTTIME due to its historically
inconsistent constant-time guarantees.

ruby/openssl@9875a01b5f

Author: samuel40791765

test/openssl/test_bn.rb

@@ -321,6 +321,8 @@ def test_argument_error
   end
 
   def test_get_flags_and_set_flags
+    return if aws_lc? # AWS-LC does not support BN::CONSTTIME.
+
     e = OpenSSL::BN.new(999)
 
     assert_equal(0, e.get_flags(OpenSSL::BN::CONSTTIME))
@@ -364,7 +366,9 @@ def test_ractor
       assert_equal(true, Ractor.new(@e2) { _1.negative? }.take)
       assert_include(128..255, Ractor.new { OpenSSL::BN.rand(8)}.take)
       assert_include(0...2**32, Ractor.new { OpenSSL::BN.generate_prime(32) }.take)
-      assert_equal(0, Ractor.new { OpenSSL::BN.new(999).get_flags(OpenSSL::BN::CONSTTIME) }.take)
+      if !aws_lc? # AWS-LC does not support BN::CONSTTIME.
+        assert_equal(0, Ractor.new { OpenSSL::BN.new(999).get_flags(OpenSSL::BN::CONSTTIME) }.take)
+      end
       # test if shareable when frozen
       assert Ractor.shareable?(@e1.freeze)
     end