Manpages of src:pstreams in Debian unstable

• pstream.h(3)
• pstreams_deprecated(3)
• redi(3)
• redi_basic_ipstream(3)
• redi_basic_opstream(3)
• redi_basic_pstream(3)
• redi_basic_pstreambuf(3)
• redi_basic_rpstream(3)
• redi_pstream_common(3)
• redi_pstreams(3)