Remove privateNetwork variable from local drv goal

Can just inline its definition, it was immutable.

Author: L-as

src/libstore/unix/build/local-derivation-goal.cc

@@ -1032,9 +1032,6 @@ void LocalDerivationGoal::startBuilder()
            us.
         */
 
-        if (derivationType->isSandboxed())
-            privateNetwork = true;
-
         userNamespaceSync.create();
 
         usingUserNamespace = userNamespacesSupported();
@@ -1062,7 +1059,7 @@ void LocalDerivationGoal::startBuilder()
 
                 ProcessOptions options;
                 options.cloneFlags = CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | CLONE_NEWUTS | CLONE_PARENT | SIGCHLD;
-                if (privateNetwork)
+                if (derivationType->isSandboxed())
                     options.cloneFlags |= CLONE_NEWNET;
                 if (usingUserNamespace)
                     options.cloneFlags |= CLONE_NEWUSER;
@@ -1879,7 +1876,7 @@ void LocalDerivationGoal::runChild()
 
             userNamespaceSync.readSide = -1;
 
-            if (privateNetwork) {
+            if (derivationType->isSandboxed()) {
 
                 /* Initialise the loopback interface. */
                 AutoCloseFD fd(socket(PF_INET, SOCK_DGRAM, IPPROTO_IP));

src/libstore/unix/build/local-derivation-goal.hh

@@ -88,11 +88,6 @@ struct LocalDerivationGoal : public DerivationGoal
      */
     std::shared_ptr<AutoDelete> autoDelChroot;
 
-    /**
-     * Whether to run the build in a private network namespace.
-     */
-    bool privateNetwork = false;
-
     /**
      * Stuff we need to pass to initChild().
      */