Update metrics dependency to use slotted libmetrics library.

BUG=chromium:342866
CQ-DEPEND=CL:185187
CQ-DEPEND=CL:186026
TEST=Trybot run on paladin, release, and chromiumos-sdk builders.

Change-Id: I0aebba6d92980c634e905c28f117730777f1bd2a
Reviewed-on: https://chromium-review.googlesource.com/186101
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
diff --git a/Makefile b/Makefile
index 9656d23..328aad1 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@
 CPPFLAGS += -I.
 CXXFLAGS += -fPIC -Wall -Werror -g
 LDLIBS += -lGobiConnectionMgmt -lGobiImageMgmt -lpthread -lrt \
-          -ludev -lmetrics -lgobi3k $(PC_LIBS)
+          -ludev -lmetrics-$(BASE_VER) -lgobi3k $(PC_LIBS)
 
 DBUSXX_XML2CPP = dbusxx-xml2cpp