www/node2{0,2,4,5}: Don't depend on security/ca_root_nss anymore

When node.js is being build with an external OpenSSL (shared linking) the option
'--openssl-use-def-ca-store' ensures that OpenSSL uses the system truststore
managed by certctl(8). If the bundled OpenSSL is used node.js comes also bundled
with a Mozilla CA bundle as well. In any case security/ca_root_nss is not required.

PR: 291482
Approved by: sunpoet (maintainer)