test: add phosphor-logging to test make

The tests now require phosphor-logging to be included as a library.

Change-Id: Ie85d7bc9f6ff687f80064c2a499e934f7bcf2616
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/Makefile.am b/test/Makefile.am
index 31e6142..c46284f 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -2,13 +2,15 @@
 AM_CXXFLAGS = \
 	$(GTEST_MAIN_CFLAGS) \
 	$(SDBUSPLUS_CFLAGS) \
-	$(PHOSPHOR_DBUS_INTERFACES_CFLAGS)
+	$(PHOSPHOR_DBUS_INTERFACES_CFLAGS) \
+	$(PHOSPHOR_LOGGING_CFLAGS)
 AM_LDFLAGS = \
 	$(GMOCK_LIBS) \
 	$(GTEST_MAIN_LIBS) \
 	$(OESDK_TESTCASE_FLAGS) \
 	$(SDBUSPLUS_LIBS) \
-	$(PHOSPHOR_DBUS_INTERFACES_LIBS)
+	$(PHOSPHOR_DBUS_INTERFACES_LIBS) \
+	$(PHOSPHOR_LOGGING_LIBS)
 
 # Run all 'check' test programs
 check_PROGRAMS = sensor_manager_unittest sensor_pluggable_unittest \