no header only in ambient occlusion demo makefile

Former-commit-id: f417247a80041c0030bb28dfb0f9b8b538977057

examples/ambient-occlusion/Makefile

@@ -9,8 +9,8 @@ all: example
 .PHONY: example
 
 LIBIGL=../../
-LIBIGL_INC=-I$(LIBIGL)/include -DIGL_HEADER_ONLY
-#LIBIGL_LIB=-L$(LIBIGL)/lib -ligl -liglembree
+LIBIGL_INC=-I$(LIBIGL)/include
+LIBIGL_LIB=-L$(LIBIGL)/lib -ligl -liglembree
 
 EIGEN3_INC=-I/opt/local/include/eigen3 -I/opt/local/include/eigen3/unsupported