deps: v8_inspector no longer depends on wtf

Remove wtf files as v8_inspector no longer needs them.

Ref: https://github.com/nodejs/node/issues/7123

PR-URL: https://github.com/nodejs/node/pull/7751


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: Minwoo Jung <jmwsoft@gmail.com>