Hi all.
I have done support for multiple subarchs (or even different configs for 
one subarch), and it seems that it will work OK.
Currently new subarch requires:
1) record in KARCHS variable in MasterInclude.mk with it's name
2) patch file into linux package, with name 
$(CONFIGNAME.config)-$(SUBARCH).patch
3) separate package description in initrd buildtool.cfg
4) separate package description in kmodules buildtool.cfg

I also removed symlink linux in the linux package directory - it is 
meanless now.

About kernel-dependent package building:
1) some packages requires path to kernel include directory - just 
replace in path $(BT_LINUX_DIR) to $(BT_LINUX_DIR)-$(BT_KERNEL_VERSION)
2) some packages (like accel-pptp's patched poptop) requires path to 
include/linux/version.h - so they wants path to linux-$(SUBARCH); IMHO 
it'll be enough to specify path to any building dir.
3) kernel modules (drivers & etc) - they must be rebuilded for _each_ 
subarch & module must be copied to corresponding directory (for examples 
- look at accel-pptp)

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