[PATCH] drivemap fixes

[Vladimir 'phcoder' Serbinenko]

Hello. As suggested by Javier Martín I move this to a new thread. This
patch fixes some problems with determining bios number of a disk.
biosnum is in boot.mod because it's where it will cause the least of
possible core.img increase (3 of 5 loaders on pc need biosnum).
Thisforced to move boot.mod to platform-specific files but this
inflexibility of build system is a subject for another patch

-- 
Regards
Vladimir 'phcoder' Serbinenko

drivemap.diff
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