webpack-make: stop including node_modules in WEBPACK_INPUTS
webpack-make: stop including node_modules in WEBPACK_INPUTS

Including node_modules in WEBPACK_INPUTS had two purposes:

  - it would make sure we distributed enough of node_modules/ that we
    got semi-meaningful license information for the packages that we
    were including (and therefore shipping minified parts of in dist/)

  - it would make sure we rebuilt after node_modules got updated

The first one is now taken care of by recent changes to the copyright
scanner which use the included-modules functionality.  The second one is
taken care of by node_modules/.stamp.

This change means that we will stop disting semi-random bits of
node_modules/ in our main tarball.

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