bliss: Add generated Huffman codes to the repository

bliss: Add generated Huffman codes to the repository

While these files are generated they don't really change and are not
architecture dependant.  The previous solution prevented cross-compilation
from the repository as `bliss_huffman` was built for the target system but
was then executed on the build host to create the source files, which
naturally was bound to fail.

The `recreate-bliss-huffman` make target can be used inside the bliss
directory to update the source files if needed.

Fixes #812.