src: add --use-bundled-ca --use-openssl-ca check

The --use-bundled-ca and --use-openssl-ca command line arguments are
mutually exclusive but can both be used on the same command line.

This commit adds a check if both options are used.

Fixes: https://github.com/nodejs/node/issues/12083
PR-URL: https://github.com/nodejs/node/pull/12087


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>