Resolve LDConfig path passed to nvidia-container-cli

Instead of relying solely on a static config, we resolve the path
to ldconfig. The path is checked for existence and a .real suffix is preferred.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

cmd/nvidia-container-runtime-hook/main.go

@@ -111,8 +111,8 @@ func doPrestart() {
 	}
 	args = append(args, "configure")
 
-	if cli.Ldconfig != "" {
-		args = append(args, fmt.Sprintf("--ldconfig=%s", cli.Ldconfig))
+	if ldconfigPath := cli.NormalizeLDConfigPath(); ldconfigPath != "" {
+		args = append(args, fmt.Sprintf("--ldconfig=%s", ldconfigPath))
 	}
 	if cli.NoCgroups {
 		args = append(args, "--no-cgroups")