libmpc: use updateAutotoolsGnuConfigScriptsHook for FreeBSD native

pkgs/by-name/li/libmpc/package.nix

@@ -1,5 +1,6 @@
 { lib, stdenv, fetchurl
 , gmp, mpfr
+, updateAutotoolsGnuConfigScriptsHook
 }:
 
 # Note: this package is used for bootstrapping fetchurl, and thus
@@ -20,6 +21,10 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   buildInputs = [ gmp mpfr ];
+  nativeBuildInputs = [
+    # needed until config scripts are updated to not use /usr/bin/uname on FreeBSD native
+    updateAutotoolsGnuConfigScriptsHook
+  ];
 
   doCheck = true; # not cross;