node: add use-shared-libraries option and remove openssl dependency

Node compiles v8, openssl and zlib on every update. Using shared v8
(and openssl/zlib) cuts compilation time.

openssl dependency was added with
mxcl/homebrew@8d45d93048676ef171b8a39a053e739c770cf832 for version
0.4.8 but it's not needed since they are including openssl in their
source code since version 0.5.4, commit:
joyent/node@e80cac622569dda0f6753b452ba3e5085a9d09e5