Bug 1041381 - Ignore missing depfiles for dtrace. r=glandium

config/rules.mk

@@ -797,6 +797,7 @@ endif
 ifdef DTRACE_PROBE_OBJ
 EXTRA_DEPS += $(DTRACE_PROBE_OBJ)
 OBJS += $(DTRACE_PROBE_OBJ)
+EXCLUDED_OBJS += $(DTRACE_PROBE_OBJ)
 endif
 
 $(filter %.$(LIB_SUFFIX),$(LIBRARY)): $(OBJS) $(EXTRA_DEPS) $(GLOBAL_DEPS)