libnsl: Add alpine patches to fix w/musl

pkgs/development/libraries/libnsl/default.nix

@@ -14,6 +14,8 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ autoreconfHook pkgconfig ];
   buildInputs = [ libtirpc ];
 
+  patches = stdenv.lib.optionals stdenv.hostPlatform.isMusl [ ./cdefs.patch ./nis_h.patch ];
+
   meta = with stdenv.lib; {
     description = "Client interface library for NIS(YP) and NIS+";
     homepage = https://github.com/thkukuk/libnsl;