avahi / avahi / 21684144324

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ci: run all the unit test suites under Valgrind

by exporting LOG_COMPILER and passing it to all the test suites
including the nss-mdns test suite.

In "fork" mode the libcheck library produces a lot of file descriptor
leak reports like
```
==78260== FILE DESCRIPTORS: 4 open (3 inherited) at exit.
==78260== Open file descriptor 3: /tmp/check_QEUdnu
==78260==    at 0x4A84B9C: open (open64.c:41)
==78260==    by 0x49DF4D7: try_tempname_len (tempname.c:264)
==78260==    by 0x49DF4D7: gen_tempname_len (tempname.c:187)
==78260==    by 0x49DF4D7: __gen_tempname (tempname.c:282)
==78260==    by 0x400F6FB: open_tmp_file (in /root/avahi/nss-mdns/check_util)
==78260==    by 0x400F8C3: receive_test_result (in /root/avahi/nss-mdns/check_util)
==78260==    by 0x40111E1: srunner_run_tagged (in /root/avahi/nss-mdns/check_util)
==78260==    by 0x400D61F: main (check_util.c:1061)
==78260==
...
==78260== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
```
so this mode is just turned off with CK_FORK=no. The part where the test
log is shown is replaced with VERBOSE=1 because it does the same thing
and is more consistent overall.

It's a follow-up to b10d81d7b.

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