Don't set flags recursively

src/Makefile

@@ -199,7 +199,7 @@ bench: $(REDIS_BENCHMARK_NAME)
 	@echo ""
 	@echo "WARNING: if it fails under Linux you probably need to install libc6-dev-i386"
 	@echo ""
-	$(MAKE) CFLAGS="$(CFLAGS) -m32" LDFLAGS="$(LDFLAGS) -m32"
+	$(MAKE) CFLAGS="-m32" LDFLAGS="-m32"
 
 gcov:
 	$(MAKE) REDIS_CFLAGS="-fprofile-arcs -ftest-coverage -DCOVERAGE_TEST" REDIS_LDFLAGS="-fprofile-arcs -ftest-coverage"