build: fix Makefile inconsistencies (trivial)

Summary:
This is in preparation for some factorization.
* Makefile (deletefile_test): Add $(COVERAGEFLAGS) to link command.
(options_test): Remove explicit (redundant) dependency on
options_helper.o: that is already a dependent, via $(LIBOBJECTS)

Test Plan: run make

Reviewers: sdong, ljin, igor

Reviewed By: igor

Subscribers: dhruba

Differential Revision: https://reviews.facebook.net/D33573

Makefile

@@ -533,7 +533,7 @@ merger_test: table/merger_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(CXX) table/merger_test.o $(LIBOBJECTS) $(TESTHARNESS) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS) $(COVERAGEFLAGS)
 
 deletefile_test: db/deletefile_test.o $(LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) db/deletefile_test.o $(LIBOBJECTS) $(TESTHARNESS) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS)
+	$(CXX) db/deletefile_test.o $(LIBOBJECTS) $(TESTHARNESS) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS) $(COVERAGEFLAGS)
 
 geodb_test: utilities/geodb/geodb_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(CXX) utilities/geodb/geodb_test.o $(LIBOBJECTS) $(TESTHARNESS) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS) $(COVERAGEFLAGS)
@@ -556,7 +556,7 @@ thread_list_test: util/thread_list_test.o $(LIBOBJECTS) $(TESTHARNESS)
 compactor_test: utilities/compaction/compactor_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(CXX) utilities/compaction/compactor_test.o $(LIBOBJECTS) $(TESTHARNESS) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS) $(COVERAGEFLAGS)
 
-options_test: util/options_test.o util/options_helper.o $(LIBOBJECTS) $(TESTHARNESS)
+options_test: util/options_test.o $(LIBOBJECTS) $(TESTHARNESS)
 	$(CXX) util/options_test.o $(LIBOBJECTS) $(TESTHARNESS) $(EXEC_LDFLAGS) -o $@ $(LDFLAGS) $(COVERAGEFLAGS)
 
 sst_dump_test: util/sst_dump_test.o $(LIBOBJECTS) $(TESTHARNESS)