ticket:10309: Changed performance regression test script not depending on ICU installation. The test programs are now invoked with a proper environment for each ICU copy. Also clean up some test scripts.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34049 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10309: Fixed LD_LIBRARY_PATH issue (missing '/')

git-svn-id: http://source.icu-project.org/repos/icu/icu@34051 251d0590-4201-4cf1-90de-194747b24ca1