Please install jq on Linux Jenkins machines using systemd coredumpctl, to make showing core dumps work

[Stephan Bergmann]

I was puzzled why e.g. 
<https://ci.libreoffice.org//job/lo_tb_master_linux_dbg/45699/consoleFull#17836743462b3c3940-aa94-44b1-926f-2d1e7de0f995>, 
where JunitTest_starmath_unoapi failed due to a soffice.bin SIGABRT, 
claimed "No core file identified" and didn't show a gdb-generated 
backtrace of the crash.  It ran on tb99.  And lode's 
bin/tb_slave_wrapper does include `ulimit -c unlimited`.

But tb99 presumably now uses systemd coredumpctl and a 
/proc/sys/kernel/core_pattern that prevents creation of core.* files in 
CWD, and instead sends them off to coredumpctl.  We have 
<https://git.libreoffice.org/core/+/d7ba78e9c7be835a1e2ecdacd25995663e96862f%5E!/> 
"New --with-coredumpctl to obtain core dumps of crashed tests from 
coredumpctl" to handle that situation.  But it requires a few tools to 
be available for our configure.ac to auto-enable --with-coredumpctl, 
namely coredumpctl, jq, systemd-escape, and systemd-run.

And it appears that jq is missing on tb99.  Can you please make sure 
that all the relevant Linux machines have all those four tools 
available?  Thanks!