make test: test V prod build

compiler/Makefile

@@ -8,9 +8,10 @@ v.c:
 	curl -Os https://raw.githubusercontent.com/vlang/vc/master/v.c
 
 test: v
+	./v -prod -o vprod . # Test prod build 
 	find .. -name '*_test.v' -print0 | xargs -0 -n1 ./v
 	echo "Building V examples..." 
 	find ../examples -name '*.v' -print0 | xargs -0 -n1 ./v
 
 clean:
-	-rm -f v.c v
+	-rm -f v.c v vprod