[NEW] zpipe:  Command-line zlib compression tool
zpipe:  Silence missing-prototype warnings
zpipe:  Halve the chunk size to reduce stack use

The 68K LINK instruction can't allocate more than 32K on the stack.
unix-tools:  Build zpipe
archive.pl:  Ship zpipe
Merge branch 'zpipe'
archive.pl:  Ship Git's test-sha1 as sha1