[CMSW_7_0_X] Enable Perl and add CA certificates bundle in GIT

The following adds CA certificates bundle into GIT, which is not available by default on Darwin platform. GIT now can verify HTTPS connection. Tested on `slc5_amd64_gcc472` and `osx108_amd64_gcc472` with github and CERN GIT.

In addition enabled Perl, which allows at least `git add --interactive` to work. Tested on  `slc5_amd64_gcc472` and `osx108_amd64_gcc472`.