* Makefile.am (kernel.json): Delete rule.
* environment.scm (arguments): substitute openssl, guile, guile-load-path,
  guile-load-compiled-path and kernel path.
  (source): Use local file.
* guix-kernel/environ.scm (guile-current-load-path->args-list,
  guix-current-load-compiled-path->args-list): New procedures.
* kernel.json: Rename 'kernel.json.in' to 'kernel.json'.
  (argv) Add '@guile@', '@LOAD_PATH@', '@LOAD_COMPILED_PATH@' and
  '@guix-jupyter-kernerl.scm@' for subsitution.
* guix-jupyter-kernel.scm (start-sub-kernel): Propagated guile load path
  and load compiled path.