Adjust liblzf to offer the LZF_STATE_ARG API, which is better for small-stack
environments (think bootblocks etc) and no worse elsewise (you can always
just pass the same state argument...) and have correct prototypes when doing
Sigh provide, by default, the dumb "allocate 64K on the stack" variant
of the lzf_compress API by default. This is because there is evidently
code floating around out there in the world with broken autoconf scripts that
don't check for LZF_STATE_ARG in the lzf header files and just assume the
dumb version of the API.
We rename the sane API to lzf_compress_r and implement the dumb API in
terms of it. Consequently, bump liblzf major version number. This is
fine because nothing used our liblzf with the old API.