build: enable runtime linking

Enable runtime linking of shared objects. This will
allow loading of symbols using the RTLD_GLOBAL flag.

PR-URL: https://github.com/nodejs/node/pull/15286
Fixes: https://github.com/nodejs/node/issues/15243


Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>