build: no longer have v8-debug.h as dependency.

Ref: #18643

PR-URL: #18677
Refs: #18643
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

node.gyp

@@ -376,7 +376,6 @@
         'src/util-inl.h',
         'deps/http_parser/http_parser.h',
         'deps/v8/include/v8.h',
-        'deps/v8/include/v8-debug.h',
         # javascript files to make for an even more pleasant IDE experience
         '<@(library_files)',
         # node.gyp is added to the project by default.