Fix #448 - clean test binaries (uplift)

Author: lars-t-hansen

Makefile

@@ -10,7 +10,7 @@ release:
 test: debug release
 	cargo test
 	( cd util ; $(MAKE) test )
-	( cd tests; ./run_tests.sh )
+	( cd tests; $(MAKE) test )
 
 format:
 	cargo fmt

tests/Makefile

@@ -1,9 +1,15 @@
 CFLAGS=-Wall -std=c89 -O1
-.PHONY: default rollup-programs clean
+.PHONY: default rollup-programs clean test
 
 default:
 	@echo "Pick a specific target"
 
+# Necessary to delete the programs here b/c sometimes the directory is shared between
+# machines with different architectures.
+test:
+	$(MAKE) clean
+	./run_tests.sh
+
 rollup-programs: rollup rollup2 rollupchild rollupchild2
 
 format: