Link probe-bcache with bcache.o, needed with -fgnu89-inline

--- bcache-tools-1.0.8/Makefile
+++ bcache-tools-1.0.8/Makefile
@@ -26,6 +26,7 @@
 make-bcache: bcache.o
 probe-bcache: LDLIBS += `pkg-config --libs uuid blkid`
 probe-bcache: CFLAGS += `pkg-config --cflags uuid blkid`
+probe-bcache: bcache.o
 bcache-super-show: LDLIBS += `pkg-config --libs uuid`
 bcache-super-show: CFLAGS += -std=gnu99
 bcache-super-show: bcache.o