some targets should be run serially

On some systems, "make" is configured to run parallelly by default. Here,
debug and local-install should always be run serially.

Author: xuhdev

Makefile

@@ -83,3 +83,5 @@ update-repository:
 
 zip-file: all
 	cd _build && zip -qr "../$(UUID)_$(VERSION).zip" .
+
+.NOTPARALLEL: debug local-install