Whitelist adapters that support aliases in `HAVING` clause

Support for using `SELECT` column or expression aliases in the `HAVING`
clause isn't part of the SQL standard so it's better to whitelist the
test for adapters where we know it works and skip it on others.

activerecord/test/cases/calculations_test.rb

@@ -249,7 +249,7 @@ def test_should_group_by_summed_field_having_condition
   end
 
   def test_should_group_by_summed_field_having_condition_from_select
-    skip if current_adapter?(:PostgreSQLAdapter, :OracleAdapter)
+    skip unless current_adapter?(:Mysql2Adapter, :SQLite3Adapter)
     c = Account.select("MIN(credit_limit) AS min_credit_limit").group(:firm_id).having("min_credit_limit > 50").sum(:credit_limit)
     assert_nil       c[1]
     assert_equal 60, c[2]