bsdtar doesn't work with ports backup of libsigc++20

[Tim Kientzle]

Sean McNeil wrote:
>
>I was doing a complete rebuild of my system and ran into a problem with
>bsdtar:
>
>portupgrade -f libsigc++-2.0.3
>
>--->  Backing up the old version
>tar: share/doc/libsigc-2.0/docs/reference/html/classsigc_1_1signal_3_01T__return_00_01T__arg1_00_01T__arg2_00_01T__arg3_00_01T__arg4_00_01T__arg5_00_01T__arg6_01_4-members.html: (null)
>** Backup failed.

I just committed a couple of changes to -CURRENT
that seem to address this: Look for rev 1.21 of
archive_write_set_format_pax.c

(Same problem as Joe Marcus Clarke reported:  long
filenames and file flags are handled through the
same "extended attribute" mechanism, which appears
to have been broken since November 4.)

Let me know.

Tim