* gentpl.py: New groups terminfoinkernel and terminfomodule.
* grub-core/Makefile.am (KERNEL_HEADER_FILES): Include extcmd.h, arg.h
and terminfo.h when needed.
* grub-core/Makefile.core.def (kernel): Include term/terminfo.c,
term/tparm.c, commands/extcmd.c, lib/arg.c on terminfokernel.
(terminfo): Enable only on terminfokernel.
(extcmd): Likewise.
* include/grub/extcmd.h: Add missing EXPORT_FUNC.
* include/grub/lib/arg.h: Likewise.
* grub-core/term/ieee1275/ofconsole.c (grub_ofconsole_dimensions): Fix
incorrect usage of ->.
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