Don't use #tap before Active Support is available, since older versions of...

Don't use #tap before Active Support is available, since older versions of ruby don't have native implementations

[#2603 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

activerecord/lib/active_record.rb

@@ -21,9 +21,8 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #++
 
-"#{File.dirname(__FILE__)}/../../activesupport/lib".tap do |path|
-  $:.unshift(path) if File.directory?(path)
-end
+activesupport_path = "#{File.dirname(__FILE__)}/../../activesupport/lib"
+$:.unshift(activesupport_path) if File.directory?(activesupport_path)
 require 'active_support'
 require 'active_support/core/all'