unit-test: add ipmiblob library lookup

To resolve this library dependency, add a lookup given the expected
pkg-config.

Change-Id: Icb235bdb33742e4ee3f9f80eae26799b2f56f998
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/scripts/unit-test.py b/scripts/unit-test.py
index 67e153c..8f318e3 100755
--- a/scripts/unit-test.py
+++ b/scripts/unit-test.py
@@ -715,6 +715,7 @@
             'gpioplus': 'gpioplus',
             'phosphor-logging': 'phosphor-logging',
             'phosphor-snmp': 'phosphor-snmp',
+            'ipmiblob': 'ipmi-blob-tool',
         },
     }