This puts NSS and OpenSSL implementations into own classes and
adds an interface to make this possible. The implementation is
now determined in Library_comphelper.
Change-Id: I4918f19bca0adfd2f9180fb418d1bd57bb83982d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/177383
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
