deps,test: fixed failures

Signed-off-by: Paolo Insogna <paolo@cowtech.it>

Author: ShogunPanda

tools/nix/sharedLibDeps.nix

@@ -48,7 +48,7 @@
   inherit (pkgs) sqlite;
 })
 // (pkgs.lib.optionalAttrs withFFI {
-  inherit (pkgs) ffi;
+  ffi = pkgs.libffi;
 })
 // (pkgs.lib.optionalAttrs withSSL (
   let