Filter /etc/grub.d/10_* so that only add-ons for native kernels are
installed.
* Makefile.in (host_kernel): New variable.
* conf/common.rmk (grub-mkconfig_SCRIPTS): Conditionalize all 10_*.in
scripts instead of just the windows one.
* configure.ac: Initialize and AC_SUBST `host_kernel'.
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