Makefile: add files and directories to remove on 'clean'.

zig-impl/makefile

@@ -25,13 +25,13 @@ doc: src/ipcd.zig
 	$(ZIGC) build-exe $(ZIGOPTS) $(ZIGMAKEDOC) $^
 
 TO_CLEAN != ls misc/*.zig | sed 's/.zig$\//' | sed 's_misc/__'
-TO_CLEAN += ipcd pong pongd snd-*
+TO_CLEAN += ipcd tcpd pong pongd
 TO_CLEAN += *.o
 clean:
 	@-rm $(TO_CLEAN) 2>/dev/null
 
 mrproper: clean
-	@-rm -r docs zig-cache zig-out 2>/dev/null
+	@-rm -r docs build zig-cache zig-out 2>/dev/null
 
 ACCESS_LOGS ?= ./access.log
 servedoc: