progs/glsl: link with GLEW library

progs/glsl/Makefile

@@ -10,7 +10,7 @@ LIB_DEP = \
 	$(TOP)/$(LIB_DIR)/$(GLU_LIB_NAME) \
 	$(TOP)/$(LIB_DIR)/$(GLUT_LIB_NAME)
 
-LIBS = -L$(TOP)/$(LIB_DIR) -l$(GLUT_LIB) -l$(GLU_LIB) -l$(GL_LIB) $(APP_LIB_DEPS)
+LIBS = -L$(TOP)/$(LIB_DIR) -l$(GLUT_LIB) -l$(GLEW_LIB) -l$(GLU_LIB) -l$(GL_LIB) $(APP_LIB_DEPS)
 
 INCLUDE_DIRS = -I$(TOP)/progs/util