Use $(MAKE) instead of directly calling `make`
Use $(MAKE) instead of directly calling `make`

This fixes `make debug` on OpenBSD (and possibly other systems) where
/usr/bin/make isn't GNU make.

clehner/vis,twinshadow/vis,twinshadow/vis,clehner/vis,cpehle/vis,rychipman/vis,8l/vis,8l/vis,cpehle/vis,rychipman/vis