[klibc] Kbuild dash headers generation

[maximilian attems]

hello Sam,

tried to sync current git dash for klibc,
but failed on this Kbuild step.

The attached patch can be applied with the
following:
 git am --directory="usr/dash" --exclude="usr/dash/configure.ac" \
         --exclude="usr/dash/ChangeLog" --exclude="usr/dash/dash.1" \
	 --exclude="usr/dash/Makefile.am"
	 --exclude="usr/dash/mksignames.c" \
	 --whitespace=fix -k -i -s ../dash/000X-foo.patch

(needs git am exclude support, which is in the second patch and easy)

The real trouble I have is that mkbuiltins is now generating a third
include file (token_vars.h) and had trouble to understand current hacks
for it already generating 2 different files. 

thank you very much for looking into this.

-- 
maks

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