libarchive fails to build on arm64 in a trusty test rebuild

[Matthias Klose]

libarchive fails to build on arm64 in a trusty test rebuild

seen at
https://launchpad.net/ubuntu/+archive/test-rebuild-20150501-updates/+build/7375918

make[5]: Entering directory `/build/buildd/libarchive-3.1.2'
PASS: bsdcpio_test
FAIL: bsdtar_test
PASS: libarchive_test
make[6]: Entering directory `/build/buildd/libarchive-3.1.2'
make all-am
make[7]: Entering directory `/build/buildd/libarchive-3.1.2'
make[7]: Leaving directory `/build/buildd/libarchive-3.1.2'
make[6]: Leaving directory `/build/buildd/libarchive-3.1.2'
============================================================================
Testsuite summary for libarchive 3.1.2
============================================================================
# TOTAL: 3
# PASS: 2
# SKIP: 0
# XFAIL: 0
# FAIL: 1
# XPASS: 0
# ERROR: 0
============================================================================
See ./test-suite.log
Please report to <email address hidden>

[Matthias Klose (doko)]

built, when given back