is *larger* than the current blocksize. Handle according to
spec. (nobyte branch)

re-add dsp.c that somehow got dropped out of versioning history at
some point.



git-svn-id: https://svn.xiph.org/branches/lowmem-no-byte/Tremor@13158 0101bb08-14d6-0310-b084-bc0e0c8e3800