www/node: Update to 8.0.0
Bump to the latest major version of Node.js. This is a major release,
including many significant changes. Users are encouraged to read the
release announcement before upgrading:
https://nodejs.org/en/blog/release/v8.0.0/
Remove files/patch-node.gyp, since this patch has been accepted
upstream.
Remove files/patch-deps_v8_src_base_atomicops__internals__arm__gcc.h,
which patches a now non-existent file after a change in how V8
implements atomic operations.