NO-JIRA: Fix install error in perl binding CMakeLists.txt

CMakeLists.txt was trying to install libcqpid_perl.so but module name is cqpid_perl.so

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1477150 13f79535-47bb-0310-9956-ffa450edef68