make: tab: put tabs in target/tab/

Author: bradjc

Makefile

@@ -187,7 +187,8 @@ $(ELF_TARGETS):
 
 .PHONY: tab
 tab: $(ELF_TARGETS)
-	elf2tab --kernel-major 2 --kernel-minor 1 -n $(EXAMPLE) -o $(EXAMPLE).tab --stack 1024 --minimum-footer-size 256 $(ELF_LIST)
+	mkdir -p target/tab
+	elf2tab --kernel-major 2 --kernel-minor 1 -n $(EXAMPLE) -o target/tab/$(EXAMPLE).tab --stack 1024 --minimum-footer-size 256 $(ELF_LIST)
 
 
 .PHONY: apollo3