Merge pull request #3064 from arunagw/jruby_test_fix_query_cache_test

fix test error when running with postgresql.

activerecord/test/cases/query_cache_test.rb

@@ -147,8 +147,10 @@ class QueryCacheTest < ActiveRecord::TestCase
   end
 
   def test_cache_does_not_wrap_string_results_in_arrays
-    require 'sqlite3/version' if current_adapter?(:SQLite3Adapter)
+    if current_adapter?(:SQLite3Adapter)
+      require 'sqlite3/version'
       sqlite3_version = RUBY_PLATFORM =~ /java/ ? Jdbc::SQLite3::VERSION : SQLite3::VERSION
+    end
 
     Task.cache do
       # Oracle adapter returns count() as Fixnum or Float