ldlibs: Try loading Clear Linux ld.so cache

Clear Linux patches glibc to put ld.so.cache in /var/cache/ldconfig/
to meet their goal of /etc being initially empty and reserved for the
sysadmin. We can handle this just like the conventional path: it
doesn't need to be architecture-specific.

Partially addresses
https://github.com/ValveSoftware/steam-runtime/issues/345

Signed-off-by: Simon McVittie <smcv@collabora.com>
6 jobs for wip/clearlinux in 8 minutes and 29 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
manual build:arch #79598
allowed to fail manual
passed build:asan #79594

00:03:29

passed build:bionic #79597

00:08:28

passed build:buster #79596

00:07:55

passed build:stretch #79595

00:08:18

passed build:ubsan #79593

00:03:25