daemon: updates previous 1 line patch for correctness

The previous commit, 880da47a,
worked on my system, but wasn't actually correct.  This follow
up patch corrects it properly.

daemon/Makefile.am

@@ -168,7 +168,7 @@ EXTRA_DIST += probes.d libvirtd.stp
 
 if WITH_DTRACE
 libvirtd_LDADD += probes.o
-libvirtd_nodist_SOURCES = probes.h
+nodist_libvirtd_SOURCES = probes.h
 
 BUILT_SOURCES += probes.h