build: add npx to zip and 7z packages

Copy npx and npx.cmd from `deps\npm\bin` for consistency with .msi
package.

PR-URL: nodejs/node#15033
Refs: nodejs/node#14235
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

vcbuild.bat

@@ -298,6 +298,10 @@ copy /Y ..\deps\npm\bin\npm node-v%FULLVERSION%-win-%target_arch%\ > nul
 if errorlevel 1 echo Cannot copy npm && goto package_error
 copy /Y ..\deps\npm\bin\npm.cmd node-v%FULLVERSION%-win-%target_arch%\ > nul
 if errorlevel 1 echo Cannot copy npm.cmd && goto package_error
+copy /Y ..\deps\npm\bin\npx node-v%FULLVERSION%-win-%target_arch%\ > nul
+if errorlevel 1 echo Cannot copy npx && goto package_error
+copy /Y ..\deps\npm\bin\npx.cmd node-v%FULLVERSION%-win-%target_arch%\ > nul
+if errorlevel 1 echo Cannot copy npx.cmd && goto package_error
 copy /Y ..\tools\msvs\nodevars.bat node-v%FULLVERSION%-win-%target_arch%\ > nul
 if errorlevel 1 echo Cannot copy nodevars.bat && goto package_error
 if not defined noetw (