neon27 fails to build in xenial on s390x

see
https://launchpad.net/ubuntu/+archive/test-rebuild-20160614/+build/9977711

using ppa:ubuntu-toolchain-r/ppa

Making check in tests
make[2]: Entering directory '/«PKGBUILDDIR»/tests'
make test-x86_64.pecoff test-i386.pecoff test-wrapper.sh \
  private-key.rsa public-cert.pem
make[3]: Entering directory '/«PKGBUILDDIR»/tests'
gcc -m64 -Wdate-time -D_FORTIFY_SOURCE=2 -c -o test-x86_64.o test.S
gcc -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -nostdlib -T ./test-x86_64.lds -o test-x86_64.elf test-x86_64.o
objcopy -j .text -j .sdata -j .data \
 -j .dynamic -j .dynsym -j .rel \
 -j .rela -j .reloc \
 --target=efi-app-x86-64 test-x86_64.elf test-x86_64.pecoff
strip test-x86_64.pecoff
gcc -m32 -Wdate-time -D_FORTIFY_SOURCE=2 -c -o test-i386.o test.S
gcc -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -nostdlib -T ./test-i386.lds -o test-i386.elf test-i386.o
objcopy -j .text -j .sdata -j .data \
 -j .dynamic -j .dynsym -j .rel \
 -j .rela -j .reloc \
 --target=efi-app-i386 test-i386.elf test-i386.pecoff
strip test-i386.pecoff
make[3]: Nothing to be done for 'test-wrapper.sh'.
openssl genrsa -out private-key.rsa 2048
Generating RSA private key, 2048 bit long modulus
.................+++
.............................................+++
e is 65537 (0x10001)
openssl req -x509 -sha256 -subj '/' -new -key private-key.rsa -out public-cert.pem
rm test-x86_64.elf test-i386.elf test-x86_64.o test-i386.o
make[3]: Leaving directory '/«PKGBUILDDIR»/tests'
make check-TESTS
make[3]: Entering directory '/«PKGBUILDDIR»/tests'
make[4]: Entering directory '/«PKGBUILDDIR»/tests'
FAIL: sign-verify.sh
PASS: sign-verify-detached.sh
FAIL: sign-detach-verify.sh
FAIL: sign-attach-verify.sh
PASS: sign-missing-image.sh
PASS: sign-missing-cert.sh
PASS: sign-missing-key.sh
PASS: verify-missing-image.sh
FAIL: verify-missing-cert.sh
PASS: sign-invalidattach-verify.sh
FAIL: cert-table-header.sh
FAIL: resign-warning.sh
FAIL: reattach-warning.sh
FAIL: detach-remove.sh
==========================================
8 of 14 tests failed
See tests/test-suite.log
Please report to <email address hidden>
==========================================
Makefile:452: recipe for target 'test-suite.log' failed
make[4]: *** [test-suite.log] Error 1
make[4]: Leaving directory '/«PKGBUILDDIR»/tests'
Makefile:530: recipe for target 'check-TESTS' failed
make[3]: *** [check-TESTS] Error 2