TODO.efiboot revision 1.4 
1- efiboot
2 * handle UEFI variables
3 * load boot.cfg from EFI system partition (FAT32)
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5- kernel
6 * handle UEFI variables (/dev/efivar)
7 * accelerated console
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9- userland
10 * efibootmgr like utility
11 * merge distrib/amd64/uefi-installimage to distrib/amd64/install-image
12 * merge distrib/amd64/uefi-installimage/Makefile.* to distrib/common/Makefile.*
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14- installer
15 * sysinst(8): handle dk(4) for install disk
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