system: Don't make /boot/grub/grub.cfg a symlink to the store.

This would not work when /boot is a separate partition, as reported by
Nikita Karetnikov <nikita@karetnikov.org> in <http://bugs.gnu.org/19220>.
This fixes a regression introduced in 39d1f82.

* gnu/build/install.scm (install-grub): Copy GRUB.CFG instead of
  symlinking it, as was the case before 39d1f82.
* gnu/build/vm.scm (register-grub.cfg-root): Add 'grub.cfg' parameter.
  Make it a permanent GC root instead of an indirect GC root.
  (initialize-hard-disk): Adjust accordingly.
* guix/scripts/system.scm (install-grub*): Replace use of
  'add-indirect-root' by the addition of a permanent GC root in
  %GC-ROOTS-DIRECTORY.

0 files changed, 0 insertions, 0 deletions