deps: v8_inspector no longer depends on wtf

Remove wtf files as v8_inspector no longer needs them.

Ref: nodejs#7123

PR-URL: nodejs#7751
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Minwoo Jung <[email protected]>

Author: ofrobots