www/node: Update 8.6.0 -> 8.8.0
Update to the latest upstream v8.x release to address a remote DoS
Remove post-patch rules to replace various occurrences of 'python' with
PYTHON_CMD. Upstream has done a change to ensure that the "correct"
python version is called at build time, making our post-patch steps
Re-roll patches with 'make makepatch'.
Approved by: robak (mentor)