更新feeds
./scripts/feeds update -a
./scripts/feeds install -a
在menuconfig选中libuhttpd，然后重新编译固件。
Libraries --->
Networking --->
<*> libuhttpd-mbedtls.................................... libuhttpd (mbedtls)
< > libuhttpd-nossl....................................... libuhttpd (NO SSL)
< > libuhttpd-openssl.................................... libuhttpd (openssl)
< > libuhttpd-wolfssl.................................... libuhttpd (wolfssl)