popt: disable

Autotools is only building a static library that refers to itself as a
runtime dependency.

overlay/default.nix

@@ -119,6 +119,8 @@ in {
       "rm $out/bin/c_rehash"; # eliminate the perl runtime dependency
   });
 
+  popt = if hostPlatform.isGenode then null else popt; # libtool problems
+
   rsync = overrideHost rsync { enableACLs = false; };
 
   solo5-tools = callPackage ./solo5-tools { };