Outsource default favicons

Makefile

@@ -59,6 +59,7 @@ bin/sesimos: bin/server.o bin/logger.o bin/cache_handler.o bin/async.o bin/worke
 			 bin/worker/request_handler.o bin/worker/tcp_acceptor.o \
 			 bin/worker/fastcgi_handler.o bin/worker/local_handler.o bin/worker/proxy_handler.o \
 			 bin/lib/http_static.o bin/res/default.o bin/res/proxy.o bin/res/style.o \
+			 bin/res/icon_error.o bin/res/icon_info.o bin/res/icon_success.o bin/res/icon_warning.o \
 			 bin/lib/compress.o bin/lib/config.o bin/lib/fastcgi.o bin/lib/geoip.o \
 			 bin/lib/http.o  bin/lib/proxy.o bin/lib/sock.o bin/lib/uri.o \
 		     bin/lib/utils.o bin/lib/websocket.o bin/lib/mpmc.o bin/lib/list.o