Add -Wno-pointer-arith to build flags, so we can play with void pointers

Makefile

 
 CXXFLAGS = -std=gnu++11 -lstdc++ $(CFLAGS)
-CFLAGS = $(autodepend) -g -Wall
+CFLAGS = $(autodepend) -g -Wall -Wno-pointer-arith
 
 autodepend = -MD $(@.o=.d) -MT $@