Many fixes.

Portability: Thanks to Juergen Lock, libarchive now compiles cleanly
on Linux. Along the way, I cleaned up a lot of error return codes and
reorganized some code to simplify conditional

Many fixes.

Portability: Thanks to Juergen Lock, libarchive now compiles cleanly
on Linux. Along the way, I cleaned up a lot of error return codes and
reorganized some code to simplify conditional compilation of certain
sections.

Bug fixes:
* pax format now actually stores filenames that are 101-154
characters long.
* pax format now allows newline characters in extended attributes
(this fixes a long-standing bug in ACL handling)
* mtime/atime are now restored for directories
* directory list is now sorted prior to fix-up to permit
correct restore of non-writable dir heirarchies

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libarchive itself is now completely clean at WARNS=10 on all architectures.

Unfortunately, the stock zlib.h is not:
line 885: 'err' parameter shadows global 'err' definition from <err.h>

Back the

libarchive itself is now completely clean at WARNS=10 on all architectures.

Unfortunately, the stock zlib.h is not:
line 885: 'err' parameter shadows global 'err' definition from <err.h>

Back the WARNS level down to 3 to accomodate borked zlib.h.

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Initial import of libarchive.

What it is:
A library for reading and writing various streaming archive
formats, especially tar and cpio. Being a library, it should
be easy to incorporate in

Initial import of libarchive.

What it is:
A library for reading and writing various streaming archive
formats, especially tar and cpio. Being a library, it should
be easy to incorporate into pkg_* tools, sysinstall, and any
other place that needs to read or write such archives.

Features:
* Full automatic detection of both compression and archive format.
* Extensible internal architecture to make it easy to add new formats.
* Support for "pax interchange format," a new POSIX-standard tar format
that eliminates essentially all of the restrictions of historic formats.
* BSD license

Thanks to: jkh for pushing me to start this work, gordon for
encouraging me to commit it, bde for answering endless style
questions, and many others for feedback and encouragement.

Status: Pretty good overall, though there are still a few rough edges and
the library could always use more testing. Feedback eagerly solicited.

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