[bug#36602] [PATCH] Add node-build-system.

[Julien Lepiller]

Hi Guix!

This patch adds a node-build-system. I wasn't sure if it was ready yet,
but I think, since I didn't change it in the last months, that it might
actually be :)

The patch was initially made by Jelle Licht, and I improved a bit on
it. Note that packages built with this build system will embed symlinks
to their dependencies, but not devDependencies (build-only
dependencies) according to the information in the metadata. Each
package is installed in lib/node_modules/package-name and symlinks are
added to lib/node_modules/package-name/node_modules. This allows us to
use only inputs instead of propagated inputs. Executables are installed
in bin according to metadata, and they should work even if called
directly from their store path.

0001-build-Add-node-build-system.patch
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