rpcd: adjust with glibc and libcrypt-compat
glibc 2.39 has removed libcrypt completely.
solution: link against libxcrypt built with glibc compatibility.
Signed-off-by: Konstantin Demin <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19293
Signed-off-by: Hauke Mehrtens <[email protected]>