egl: Don't install demodriver

I don't think anyone besides a developer would ever want to use the demo
egl driver. Furthermore, egl would only ever load demodriver if it was
set via EGL_DRIVER in the environment. In that case, I think you can
point it to your mesa source directory.

src/egl/drivers/demo/Makefile

@@ -26,8 +26,6 @@ $(TOP)/$(LIB_DIR)/demodriver.so: $(OBJECTS)
 		$(OBJECTS)
 
 install:
-	$(INSTALL) -d $(DESTDIR)$(INSTALL_LIB_DIR)
-	$(INSTALL) $(TOP)/$(LIB_DIR)/demodriver.so $(DESTDIR)$(INSTALL_LIB_DIR)
 
 clean:
 	-rm -f *.o