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>
diff --git a/scripts/unit-test.py b/scripts/unit-test.py
index 891e2af..7405395 100755
--- a/scripts/unit-test.py
+++ b/scripts/unit-test.py
@@ -284,7 +284,9 @@
     for pkg in dep_list:
         pkgdir = os.path.join(WORKSPACE, pkg)
         # Build & install this package
-        conf_flags = []
+        conf_flags = [
+            '--disable-silent-rules',
+        ]
         os.chdir(pkgdir)
         # Add any necessary configure flags for package
         if CONFIGURE_FLAGS.get(pkg) is not None: