Replace small/large buffer tests with parameterized test_chunked

Replace small/large buffer tests with parameterized test_chunked

test_large_buffers reset d_stream.next_out on every inflate iteration, so the
decompressed output was never compared against the source. test_chunked keeps
the input, compressed, and decompressed buffers separate and checks them with
memcmp.

New avail_out values (3, 64, 128, 256, 259) exercise inflate_fast()'s safe-mode
MATCH-state bailout around the 258-byte maximum match length.