test: disable object dependencies in main makefile

When the main makefile is used to get the list of chronyd objects in
order to build the unit tests, clang started (with the -MM option) to
generate the dependency files prints error messages about wrong
inclusions. Set a NODEPS variable to completely disable the generation
of the files.

Makefile.in

@@ -134,4 +134,6 @@ Makefile : Makefile.in configure
 .deps/%.d: %.c | .deps
 	@$(CC) -MM $(CPPFLAGS) -MT '$(<:%.c=%.o) $@' $< -o $@
 
+ifndef NODEPS
 -include $(ALL_OBJS:%.o=.deps/%.d)
+endif

test/unit/Makefile.in

@@ -12,7 +12,8 @@ TEST_OBJS := $(sort $(patsubst %.c,%.o,$(wildcard *.c)))
 TESTS := $(patsubst %.o,%.test,$(filter-out $(SHARED_OBJS),$(TEST_OBJS)))
 
 CHRONYD_OBJS := $(patsubst %.o,$(CHRONY_SRCDIR)/%.o,$(filter-out main.o,\
-		  $(filter %.o,$(shell $(MAKE) -f $(CHRONY_SRCDIR)/Makefile print-chronyd-objects))))
+		  $(filter %.o,$(shell $(MAKE) -f $(CHRONY_SRCDIR)/Makefile \
+					print-chronyd-objects NODEPS=1))))
 
 all: $(TESTS)