unit-test: Use verbose make rules by default

Silent make rules can be nice for the end user, but it makes it hard to
diagnose what went wrong with a build if the compiler flags are funky.

Tested:
    sdbusplus and phosphor-logging still test out fine.

Change-Id: I46b9c628156b45e8776be223ab01d4c1b15484b6
Signed-off-by: William A. Kennington III <wak@google.com>
1 file changed