The uClibc library support was removed since commit:
57fe7d5401 ("toolchain: remove uClibc install stuff")
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Link: https://github.com/openwrt/openwrt/pull/16605
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>