fixed typo, can now make run from root

Makefile

@@ -4,5 +4,8 @@ all: buildit
 buildit:
 	cd build && make all
 
+run:
+	cd build && make run
+
 clean:
 	cd build && make clean

build/Makefile

@@ -35,7 +35,7 @@ image:
 clean:
 	rm -f a.rim $(IMAGEFILE) a.lst n.out
 	rm -rf $(BINDIR)
-	rm -rr $(TESTDIR)
+	rm -rf $(TESTDIR)
 
 dirs:
 	mkdir -p $(BINDIR)