BUG:  Properly pass OpenSSL libraries to python project. Fixes #3620

In attempt to fix #3620, commit r22939 completely removed the transformation
of list OPENSSL_LIBRARIES assuming the macro 'ExternalProject_Include_Dependencies'
would proceed to the required updates.

It turns out that since the variable is directly passed as CMAKE_ARGS
to the python project, the list has to be explicitly transformed.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22940 3bd1e089-480b-0410-8dfb-8563597acbee