libarchive: add ptest support

libarchive: add ptest support

Add ptest support to enable automated testing of libarchive
using ptest-runner.

The implementation builds and installs five test suites:
libarchive_test, bsdtar_test, bsdcpio_test, bsdcat_test, and
bsdunzip_test, along with their test data files.

Test executables for bsdtar, bsdcpio, bsdcat, and bsdunzip are
provided via symlinks to the installed binaries.

All tests on qemux86-64 pass:
  libarchive_test: 689 tests
  bsdtar_test: 76 tests
  bsdcpio_test: 49 tests
  bsdcat_test: 18 tests
  bsdunzip_test: 8 tests

Signed-off-by: Pratik Farkase <pratik.farkase@est.tech>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>