Fix exclusion of long file names when extracting from pax format archives.

Fix exclusion of long file names when extracting from pax format archives.

* src/list.c (read_and): Call decode_header before attempting
name_match.
(list_archive): Remove call to decode_header.

* src/compare.c (diff_archive): Remove call to decode_header.
* src/extract.c (extract_archive): Likewise.

* test/exclude06.at: New test case.
* tests/testsuite.at: Include exclude06.at.
* tests/Makefile.am (TESTSUITE_AT): Add exclude06.at.