tools: remove v8_inspector third party license

nodejs#9028 made Node.js use the V8
inspector bundled with the deps/v8 and removed the third party
dependency. We can safely omit the non-existent license file.

Author: thefourtheye

tools/license-builder.sh

@@ -82,9 +82,6 @@ addlicense "gtest" "deps/gtest" "$(cat ${rootdir}/deps/gtest/LICENSE)"
 addlicense "node-weak" "test/gc/node_modules/weak" \
            "$(cat ${rootdir}/test/gc/node_modules/weak/LICENSE)"
 
-# v8_inspector
-addlicense "v8_inspector" "deps/v8_inspector/third_party/v8_inspector" \
-           "$(cat ${rootdir}/deps/v8_inspector/third_party/v8_inspector/LICENSE)"
 # Build tooling for v8_inspector
 addlicense "jinja2" "deps/v8_inspector/third_party/jinja2" \
            "$(cat ${rootdir}/deps/v8_inspector/third_party/jinja2/LICENSE)"