zim-tools 3.2.0-1 fails to build on amd64, ppc64el, and s390x: zimcheck-test fails

[Benjamin Drung]

zim-tools 3.2.0-1 fails to build on amd64, ppc64el, and s390x, because the test case zimcheck-test fails:

amd64:

```
==================================== 4/4 =====================================
test: zimcheck-test
start time: 09:04:26
duration: 0.18s
result: killed by signal 11 SIGSEGV
command: MALLOC_PERTURB_=57 /<<PKGBUILDDIR>>/obj-x86_64-linux-gnu/test/zimcheck-test
----------------------------------- stdout -----------------------------------
Running main() from ./googletest/src/gtest_main.cc
[==========] Running 36 tests from 2 test suites.
[----------] Global test environment set-up.
[----------] 7 tests from zimfilechecks
[ RUN ] zimfilechecks.test_checksum
[INFO] Verifying Internal Checksum...
[ OK ] zimfilechecks.test_checksum (3 ms)
[ RUN ] zimfilechecks.test_metadata
[INFO] Checking metadata...
==============================================================================

Summary of Failures:

4/4 zimcheck-test FAIL 0.18s killed by signal 11 SIGSEGV
```

Full log: https://launchpadlibrarian.net/683922018/buildlog_ubuntu-mantic-amd64.zim-tools_3.2.0-1_BUILDING.txt.gz

ppc64el:

```
==================================== 4/4 =====================================
test: zimcheck-test
start time: 09:05:16
duration: 0.24s
result: killed by signal 11 SIGSEGV
command: MALLOC_PERTURB_=191 /<<PKGBUILDDIR>>/obj-powerpc64le-linux-gnu/test/zimcheck-test
----------------------------------- stdout -----------------------------------
Running main() from ./googletest/src/gtest_main.cc
[==========] Running 36 tests from 2 test suites.
[----------] Global test environment set-up.
[----------] 7 tests from zimfilechecks
[ RUN ] zimfilechecks.test_checksum
[INFO] Verifying Internal Checksum...
[ OK ] zimfilechecks.test_checksum (3 ms)
[ RUN ] zimfilechecks.test_metadata
[INFO] Checking metadata...
==============================================================================

Summary of Failures:

4/4 zimcheck-test FAIL 0.24s killed by signal 11 SIGSEGV
```

Full log: https://launchpadlibrarian.net/683922136/buildlog_ubuntu-mantic-ppc64el.zim-tools_3.2.0-1_BUILDING.txt.gz

s390x:

```
==================================== 3/4 =====================================
test: zimcheck-test
start time: 09:18:04
duration: 0.20s
result: killed by signal 11 SIGSEGV
command: MALLOC_PERTURB_=140 /<<PKGBUILDDIR>>/obj-s390x-linux-gnu/test/zimcheck-test
----------------------------------- stdout -----------------------------------
Running main() from ./googletest/src/gtest_main.cc
[==========] Running 36 tests from 2 test suites.
[----------] Global test environment set-up.
[----------] 7 tests from zimfilechecks
[ RUN ] zimfilechecks.test_checksum
[INFO] Verifying Internal Checksum...
[ OK ] zimfilechecks.test_checksum (3 ms)
[ RUN ] zimfilechecks.test_metadata
[INFO] Checking metadata...
==============================================================================
[...]
Summary of Failures:

3/4 zimcheck-test FAIL 0.20s killed by signal 11 SIGSEGV
```

Full log: https://launchpadlibrarian.net/683923514/buildlog_ubuntu-mantic-s390x.zim-tools_3.2.0-1_BUILDING.txt.gz