ticket:8449 fix broken build from earlier checkin.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34054 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10310 Improve C++11 handling in configure script

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@34055 251d0590-4201-4cf1-90de-194747b24ca1