Move assembly code to C by using intwrap. It increases core size

	Move assembly code to C by using intwrap. It increases core size
	by 88 bytes but improves compatibility and maintainability.

	* grub-core/kern/i386/pc/startup.S (grub_console_putchar): Moved to ...
	* grub-core/term/i386/pc/console.c (grub_console_putchar_real):
	... here. Translated to C.
	* grub-core/kern/i386/pc/startup.S (grub_console_getkey): Moved to ...
	* grub-core/term/i386/pc/console.c (grub_console_getkey):
	... here. Translated to C.
	* grub-core/kern/i386/pc/startup.S (grub_console_getxy): Moved to ...
	* grub-core/term/i386/pc/console.c (grub_console_getxy):
	... here. Translated to C.
	* grub-core/kern/i386/pc/startup.S (grub_console_gotoxy): Moved to ...
	* grub-core/term/i386/pc/console.c (grub_console_gotoxy):
	... here. Translated to C.
	* grub-core/kern/i386/pc/startup.S (grub_console_cls): Moved to ...
	* grub-core/term/i386/pc/console.c (grub_console_cls):
	... here. Translated to C.
	* grub-core/kern/i386/pc/startup.S (grub_console_setcursor): Moved to ..
	* grub-core/term/i386/pc/console.c (grub_console_setcursor):
	... here. Translated to C.
	* grub-core/kern/i386/pc/startup.S (grub_get_rtc): Moved to ..
	* grub-core/kern/i386/pc/init.c (grub_get_rtc): ... here.
	Translated to C.
	* grub-core/term/i386/pc/console.c (int10_9): New function.
	(grub_console_putchar): Likewise.
	* include/grub/i386/pc/console.h: Removed the not anymore shared
	functions.