pgcopydb: propagate postgresql's buildInputs

Some of the build inputs required here are required because this links
against internals of PostgreSQL. The latter might be configured with
different dependencies on different platforms and such, so it's easier
to just depend on postgresql's build inputs.

This fixes the build with PostgreSQL 18, which added libnuma as a new
dependency.

pkgs/by-name/pg/pgcopydb/package.nix

@@ -31,18 +31,11 @@ clangStdenv.mkDerivation (finalAttrs: {
     postgresql.pg_config
   ];
 
-  buildInputs = [
+  buildInputs = postgresql.buildInputs ++ [
     boehmgc
-    libkrb5
-    openssl
     postgresql
-    readline
     sqlite
-    zlib
     python3Packages.sphinxHook
-  ]
-  ++ lib.optionals clangStdenv.hostPlatform.isLinux [
-    pam
   ];
 
   hardeningDisable = [ "format" ];