pkey/dh: tweak break tests for AWS-LC

We reecently tweaked some break tests in test_pkey_dh.rb due to
different behavior with OpenSSL in FIPS mode.
AWS-LC does not inherit the same specific behavior, so tests
have been adjusted accordingly.

Author: samuel40791765

test/openssl/test_pkey_dh.rb

@@ -19,7 +19,7 @@ def test_new_generate
   end if ENV["OSSL_TEST_ALL"]
 
   def test_new_break_on_non_fips
-    omit_on_fips
+    omit_on_fips if !aws_lc?
 
     assert_nil(OpenSSL::PKey::DH.new(NEW_KEYLEN) { break })
     assert_raise(RuntimeError) do
@@ -29,6 +29,7 @@ def test_new_break_on_non_fips
 
   def test_new_break_on_fips
     omit_on_non_fips
+    return unless openssl? # This behavior only applies to OpenSSL.
 
     # The block argument is not executed in FIPS case.
     # See https://github.com/ruby/openssl/issues/692 for details.